Answer:
46.8% should be. correct, I'm not fully sure though. : )
The mass percentage of the carbon in the caffeine C₈H₁₀N₄O₂ is equal to 49.48 %.
What is the mass percent formula?The mass percentage formula can be expressed by mass of the each element in one mole of the compound divided by the molar mass of the compound.
The mass percentage of one component in any compound can be calculated as follows:
Mass percent = (Mass of an element one mole of the compound)/(Molar mass of compound) ×100
Given, the chemical formula of the compound caffeine is C₈H₁₀N₄O₂.
The molar mass of the caffeine, C₈H₁₀N₄O₂ = 194 g/mol
We know that the atomic mass of carbon (C) = 12 g/mol
The mass of the carbon in caffeine = 8 × 12 = 108 g/mol
The mass percent of carbon = (108/194) × 100 = 49.48 %
Therefore, the mass percentage of carbon in caffeine is equal to 49.48 %.
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Can someone help me with my chemistry problem?
Answer:
D. 108g of water
Explanation:
16g CH4 produces 2(18)g of H20
1g CH4 produces [tex]\frac{36}{16}[/tex]g of H2O
48g CH4 produces [tex]\frac{36}{16}[/tex]×48
108g of H20
Answer:
D. 108g of water
Explanation:
Which sample has the largest volume? the density of aluminum is 2. 7 g∙cm–3, and the density of copper is 9. 0 g∙cm–3
The sample which has the largest volume is 5 grams of aluminum.
What is density?Density is the mass of per unit volume.
Given, density of aluminum is 2.7 g.cm
The density of copper is 9. 0 g.cm
Step1: Calculate the volume
a. volume of copper of 1.0 gram
[tex]\dfrac{mass}{density} = \dfrac{1}{9} = 0.112[/tex]
Volume of copper of 5.0 gram
[tex]\dfrac{mass}{density} = \dfrac{5}{9} = 0.55[/tex]
b. aluminum of 1 gram
[tex]\dfrac{1}{2.7} = 0.370[/tex]
Aluminum of 5 gram
[tex]\dfrac{5}{2.7} = 1.851[/tex]
Thus, 5 gram of aluminum has the largest volume.
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What type of sugar is characterized as best for meringue and some cakes because it dissolves more easily?
Answer:
granulated sugar
Explanation:
the rate of dissolving can be increased by mixing stirring and agitating the
solution. hope this answers your question
The molar mass of kcl is 74.55 g/mol. if 8.45 g kcl are dissolved in 0.750 l of solution, what is the molarity of the solution? use molarity equals startfraction moles of solute over liters of solution endfraction.. 0.113 m 0.151 m 6.62 m 11.3 m
Answer: 0.151 M
Explanation:
We first need to convert the amount of KCl into moles. This is 8.45/74.55 = 0.113 moles.
So, the molarity is 0.113/0.750 = 0.151 M
How does the parts of a seed help it carry out its function please try to use your own words it’s for my lab..
[tex]\huge\bf\maltese{\underline{\red{J0|N}}}\maltese[/tex]
When different parts of the oceans are heated unevenly this causes the water to?
Answer:
move in convection currents
Explanation:
When different parts of the oceans are heated unevenly this causes the water to move in convection currents.
Aeronautical researchers have developed three different processes to pack a parachute. They want to compare the different processes in terms of time to deploy and reliability. There are 1,200 objects that they can drop with a parachute from a plane. Using a table of random digits, the researchers will randomly place the 1,200 items into three equally sized treatment groups suitable for comparison.
Which design is the most appropriate for this experiment?
Randomly number each item with 1, 2, or 3. Assign the items labeled 1 to the process 1 group, assign the items labeled 2 to the process 2 group, and assign the items labeled 3 to the process 3 group.
Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Number each item from 0000 to 1199. Reading from left to right on a random number table, identify 800 unique four-digit numbers from 0000 to 1199. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Select an item, and identify the first digit reading from left to right on a random number table. If the first digit is a 1, 2, or 3, assign the item to the process 1 group. If the first digit is a 4, 5, or 6, assign the item to the process 2 group. If the first digit is a 7, 8, or 9, assign the item to the process 3 group. If the first digit is a 0, skip that digit and move to the next one to assign the item to a group. Repeat this process for each item.
The best design for this experiment is to number the items from 1 to 1,200 and then choose random numbers in the table of random digits (second option).
How to use a table of random digits?These tables are used to randomly assign items or subjects into groups when experimenting. The best way to use these tables are:
Give each item or participant a number.Take a lot at the table and choose a number.If this number is the same that the number assigned to an item or participant classify it in the first group.Keep selecting.Based on this, for this experiment the steps are:
Number the items from 1 to 1,200. Identify numvers in the table.Assign the first 400 items to the process 1 group. Repeat the process for the other two groups.Learn more about experiments in: https://brainly.com/question/11256472
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Answer:
b. Number each item from 1 to 1,200. Reading from left to right from a table of random digits, identify 800 unique numbers from 1 to 1,200. Assign the items with labels in the first 400 numbers to the process 1 group. Assign the items with labels in the second 400 numbers to the process 2 group. Assign the remaining items to the process 3 group.
Explanation:
Statistics A edg. 2023
PLEASE HELP, WILL GIVE BRAINLIEST
Answer:
See below
Explanation:
1)
.897 J / g-C * 100 gm * 120 C = 10764 J (see how the 'units' cancel out?)
2) spec heat = 963.6 J / (120 gm (90-80 C) =
963.6 / ( 120 * 10) = .803 J / g-C
from the table, this is granite
What are the formulas to go back and forth from concentration to pH?
Answer:
To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].
Explanation:
where do most of the elements on the periodic table come from?
Stars
All the elements on earth have been cooked from billions of years in stars and the released in the universe through super-nova explosions
elements was not easily spotted by ancient cultures?
Answer:
Bromine (Br)
Explanation:
Im assuming thats the answer you are looking for since you didnt include any options :,)
How many molecules of hydrogen will be required to produce 1. 60 mol of water
The number of molecules of hydrogen will be required to produce 1.60 mol of water are 9.6×10²³.
What is the stoichiometry?Stoichiometry of the reaction gives idea about the relative amount of moles of reactants and products present in the given chemical reaction.
Given chemical reaction is:
2H₂ + O₂ → 2H₂O
From the stoichiometry of the reaction,
2 moles of hydrogen = produces 2 mole of water
1.6 moles of hydrogen = produces 1.6 mole of water
As we know that in 1 mole of any substance 6.022×10²³ entities of that substance are present.
In 1.6 mole of H₂ gas = (1.6)(6.022×10²³) = 9.6×10²³ molecules of hydrogens are present.
Hence 9.6×10²³ molecules of hydrogens are present.
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The asphalt in the la brea tar pits is composed of hydrocarbons, but is not considered a fossil fuel. please select the best answer from the choices provided t f
The statement is true because asphalt in the la brea tar pits can not be burnt to produce energy henece they are not fossil fuels.
What are fossil fuels?Fossil fuels are those hydrocarbons that are burnt to liberate energy. They include; crude oil, natural gas, coal, etc,
The statement is true because asphalt in the la brea tar pits can not be burnt to produce energy henece they are not fossil fuels.
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Answer:
False
Explanation:
The answer is false I just took the test , the other answer is incorrect.
Which of the following is an example of exercise?
a) playing chesss
b) watching basketball
c) riding your bike
Answer:
c.) riding your bike
Explanation:
Playing chess doesn't require any physical challenges, just mental
While watching basketball, you don't physiclly move
Riding a bike requires physical movement and acceliration
Therefore C is the correct answer
A stock solution is made by dissolving 66.05 g of (nh4)2so4 in enough water to make 250 ml of solution. a 10.0 ml sample of this solution is then diluted to 50.0 ml. given that the molar mass of (nh4)2so4 is 132.1 g/mol, what is the concentration of the new solution? use m subscript i v subscript i equals m subscript f v subscript f. and molarity equals startfraction moles of solute over liters of solution endfraction.. 0.400 m 1.60 m 5.00 m 10.0 m
The concentration of the new solution of the ammonium sulphate, (NH₄)₂SO₄ given the data is 0.4 M
How to determine the mole of (NH₄)₂SO₄Mass of (NH₄)₂SO₄ = 66.05 gMolar mass of (NH₄)₂SO₄ = 132.1 g/mol Mole of (NH₄)₂SO₄ =?Mole = mass / molar mass
Mole of (NH₄)₂SO₄ = 66.05 / 132.1
Mole of (NH₄)₂SO₄ = 0.5 mole
How to determine the molarity of (NH₄)₂SO₄Mole of (NH₄)₂SO₄ = 0.5 mole Volume = 250 mL = 250 / 1000 = 0.25 L Molarity of (NH₄)₂SO₄ =?Molarity = mole / Volume
Molarity of (NH₄)₂SO₄ = 0.5 / 0.25
Molarity of (NH₄)₂SO₄ = 2 M
How to determine the molarity of the diluted solution Volume of stock solution (V₁) = 10 mL Molarity of stock solution (M₁) = 2 MVolume of diluted solution (V₂) = 50 mLMolarity of diluted solution (M₂) =?M₁V₁ = M₂V₂
2 × 10 = M₂ × 50
20 = V₂ × 50
Divide both side by 50
M₂ = 20 / 50
M₂ = 0.4 M
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Answer:
A: 0.400 M
Explanation:
i need a chemistry questions about separating method
Which of the following changes would result in an increase of nitrogen dioxide, NO2?
N204() <---> 2NO2(g)
AH° = 58 kJ
This can be solved according to Le C ha.tellors principle
Any change in concentration, temperature, pressure can shift the equilibriumSo
Here to increase NO_2
We need to increase the temperature or increase the concentrations of reactants
The addition of N₂O₄(g) to the system would result in an increase of nitrogen dioxide, NO₂.
The balanced equation provided shows the equilibrium between nitrogen dioxide (NO₂) and dinitrogen tetroxide (N₂O₄). According to Le Chatelier's principle, a change in conditions will cause the system to shift in a way that opposes the change. In this case, if N₂O₄ is added to the system, the equilibrium will shift to the right to consume the added N₂O₄ and produce more NO₂.
Based on the given information, the enthalpy change (AH°) for the reaction is 58 kJ. This indicates that the forward reaction (from N₂O₄ to 2NO₂) is endothermic, meaning it requires heat to proceed. Adding N₂O₄ to the system will provide more reactant molecules, increasing the concentration of N₂O₄ and causing the equilibrium to shift towards the products (more NO₂) to minimize the effect of the added N₂O₄.
Therefore, the addition of N₂O₄ to the system will result in an increase in nitrogen dioxide, NO₂, as the equilibrium shifts to the right to restore equilibrium.
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For the molecule c3h9n, draw a structural formula and its lewis dot structure
For the molecule propylamine, structural formula and its Lewis dot structure is attached below in image.
What is Lewis dot structure?Lewis structures, or electron dot structures, are diagrams that show how electrons are shared and distributed around atoms. Lone pairs are electrons that belong to a single atom and are represented by dots.
In normal structural formula of propylamine only bonds are showing and in Lewis dot structure with bonds number of lone pair of electrons or charge present on any atom is also showed. Each single bond present in the structure is formed by the sharing of 2 electrons and it is shown in the attached image.
Hence structural formula and Lewis dot structure is attached in the image.
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Why did the United States cut off trade and diplomatic relations with Cuba?
Answer:
It was retaliation for the nationalization of U.S. corporations property by Cuba.
Explanation:
Answer:
Cuba created a communist government and a dictatorship made by Fidel Castro. USA obviously did not approve of this so they responded by severing trade and diplomatic relations with Cuba.
The process due to which a solid directly changes into its vapours.
Help please
Answer:
Sublimation
Explanation:
Make a comparison between all five states of matter
Class 9
Answer:
States of Matter
Solid has fixed volume.
Solid has fixed shape.
Solid has high density.
Solids are heavy.
Solid does not flow.
How does an increase in temperature affect a gas when the volume is fixed? (Fixed means it stays the same.)
Question 13 options:
The molecules have the same kinetic energy, the same distance between particles, and the same pressure
The molecules have a lower kinetic energy, causing a decrease in distance between particles and a decreased pressure
The molecules have higher kinetic energy, causing an increase in distance between particles which causes increased pressure
An increase in temperature at constant volume will increase the kinetic energy and the distance. Thus, option c is correct.
What is Gay-Lussac's law?Gay-Lussac's law is the ideal gas law that defines the direct relation of the temperature to the pressure of the gas at a constant volume.
With an increase in the temperature of the gas, the pressure also rises causing the distance between the particle to expand by the increase in the kinetic energy.
Therefore, option c. the kinetic energy, particle distance, and the pressure increases with tempearture rise.
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How many ions are there in 13grms of K+ ions (k=39,L=6.0by10 raised to power23
Answer:
1) k2O = 2K(1+) + O(2-)This is, every molecule of K2O
Explanation:
hope this helps if not let me know have a blessed day
What is the function of the seed in the plant? can’t copy and paste what the internet has
Answer:
Seed is the actual medium of reproduction in plants. It could be considered as the result of gametic stage of reproduction producing the basic and fundamental prototype of the parent plant called embryo covered inside a hard protective coat I.e. testa
I read this in 6th std
two human actions needed to slow climate change
Answer:
using electric cars , Transitioning to energy sources that do not emit greenhouse gases, such as solar, wind, biofuels, and nuclear ☢️
Explanation:
Select the terms that describe a mind map.
detailed
detailed
graphic
graphic
colorful
colorful
textual
textual
unordered
unordered
creative
creative
linear
All these terms describe a mind map detailed graphic , colorful , unordered and creative
What is a mind map ?A mind map is a diagram used to visually organize information into a hierarchyIt shows relationships among pieces of the whole.It is often created around a single concept, drawn as an image in the center of a blank page, to which associated representations of ideas such as images, words and parts of words are added. Major ideas are connected directly to the central concept, and other ideas branch out from those major ideas.The terms that describes a mind map are detailed , as lots of detailing is done using connection symbols
Graphic , they are graphical representation of an information
Colourful , They are colourful as to make it more visually interesting .
Unordered , They information might not be in sequence and so can be called unordered also
Creative , Yes it is creative as it brings out the artist inside you and you think more ideas to make it look more beautiful and understandable .
So All these terms describe a mind map detailed graphic , colorful , unordered and creative.
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A(n)_____ is a structure that consists of dna and protein molecules coiled into a definite shape
Answer:
Double helix
Explanation:
Its like two starcaises intertwined.
Answer:
D
Explanation:
D is the answer had to find out the harder way
ASAP PLEASEE A certain amount of Argon has 2.4x10^24 atoms. Going backwards from Atoms to Grams, how many grams of Ar would that be?
The required mass of argon in given number of atoms of argon is 155.61 grams.
What is Avogadro's number?Avogadro's number is the number of atoms which are present in 1 mole of any substance and it is equal to 6.022×10²³.
Relation between the mass and moles of any substance will be represented as:
n = W/M, whereW = given massM = molar massSo, moles of argon will be calculated by using given number of atoms as:
Moles = 2.4×10²⁴ atoms / 6.022×10²³ atoms per mole
Moles = 3.9 moles
Now mass will be:
W = (3.9mol)(39.9g/mol) = 155.61 g
Hence required mass of argon is 155.6g.
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A+certain+protein+was+found+to+contain+0. 579%+zinc+by+mass. +determine+the+minimum+molecular+mass+of+the+protein
Molecular mass is the total of the atomic masses of all the atoms in the molecule. The minimum molecular mass of the protein is 11,363.64 g/mol.
What is the percent by mass?The percent by mass is the percentage composition of the mass of the solute in the mass of the solution.
As the percent by mass of zinc is 0.579 then in 100 gm of substance 0.579 gm zinc will be present. The molar mass of zinc is 65.38 u. Moles of zinc will be calculated as:
[tex]\begin{aligned} \rm moles &= \rm \dfrac {mass}{molar\; mass}\\\\&= \dfrac{0.579}{65.38}\\\\&= 0.0088\;\rm moles\end{aligned}[/tex]
So, the molecular mass of the protein will be:
[tex]\dfrac{100}{0.0088} = 11,363.64 \;\rm g/mol[/tex]
Therefore, 11,363.64 g/mol is the minimum molecular mass of the protein.
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What is [tex]K_c[/tex] for the following equilibrium concentration of each substance is :
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g)[/tex]
As per the question ,
[tex]2SO_2(g)+O_2\rightleftharpoons2SO_3(g) [/tex] (given)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex]K_c = \frac{[SO_3]^2}{[SO_2]^2[O_2]}[/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: \: = \frac{ ( 1.9)^2M^2}{(0.6)^2(0.82)M^3} [/tex]
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
[tex] \: \: \: \: = 12.229 M^{ - 1}[/tex] (approximately)
[tex]\: \: \: \: \: \: \: \: \: \: \: \: \: \: [/tex]
Hence , K for the equilibrium is [tex]12.229M^{-1}[/tex]
