A venti latte (502mL) contains 0.322g caffeine, C8H10N4O2, express this concentration in molarity.
Answer:
0.00331M
Explanation:
Molarity of a solution can be calculated as follows:
Molarity = number of moles (n) ÷ volume (V)
In the information provided in this question, the volume = 502mL = 502/1000 = 0.502L, mass of caffeine = 0.322g
Molar mass of caffeine (C8H10N4O2), where C = 12, H = 1, N = 14, O = 16 is as follows:
Molar mass = 12(8) + 1(10) + 14(4) + 16(2)
= 96 + 10 + 56 + 32
= 194g/mol
Using, moles = mass/molar mass
moles = 0.322/194
moles = 1.66 × 10-³ moles
mole = 0.00166mol
Molarity = number of moles ÷ volume
Molarity = 0.00166mol ÷ 0.502L
Molarity = 0.00331M.
Calculate the pH is the
concentration of [H+] = 1.00x 10^-11
Answer:
1e - 11
Explanation:
Nhich types of native organisms do feral hogs most likely compete with for food sources?
F.
Carnivores and producers
G.
Herbivores and carnivores
H.
Producers and decomposers
J.
Decomposers and herbivores
Cyanobacteria, also known as blue-green algae, are a kind of bacteria found in lakes. These organisms make their own food through photosynthesis. Small animals including mayfly larvae eat the cyanobacteria, and small fish such as yellow perch eat the larvae. The small fish provide food for larger fish, such as walleye.
Choose the level of the food pyramid that represents the energy role of cyanobacteria in the lake ecosystem.
Which of the following formulas represent acids? Select all that apply.
a. NaOH
b. HCI
c. H2SO4
d. Ca(OH)2
e. KOH
f. HNO3
Answer:
B. HCl, C. H2SO4, F. HNO3
Explanation:
Acids have hydrogen (H) at the beginning
bases have OH at the end
HCl, H₂SO₄,HNO₃ are the chemical formulas which represent acids.
What are acids?Acids are defined as substances which on dissociation yield H+ ions , and these substances are sour in taste. Out of the following , given sets of compounds HCl, H₂SO₄ and HNO₃ are acids as they yield H+ ions on dissociation.
According to the number of H+ ions which are generated on dissociation acids are classified as mono-protic , di-protic ,tri-protic and polyprotic acids depending on the number of protons which are liberated on dissociation.
Acids are widely used in industries for production of fertilizers, detergents batteries and dyes.They are used in chemical industries for production of chemical compounds like salts which are produced by neutralization reactions.
Learn more about acids,here:
https://brainly.com/question/13586622
#SPJ2
which reacts faster, rock salt or grains of salt? Why?
Answer:
salt
Explanation:
because it has a much larger volume ratio
When Svante Arrhenius first proposed his acid base theory, he was a doctoral candidate. His professors thought his ideas were unfounded. Within a decade, the Arrhenius theory of acid base was widely accepted and praised within the scientific world. Arrhenius defined acids as compounds having an ionizable hydrogen and bases as compounds with ionizable hydroxides. Eventually scientists adopted a broader theory which includes more compounds to define acids and bases. The Bronsted-Lowry acid base theory defines an acid as a _______ and a base as a ______________.
Answer:
proton donar
proton acceptor
Explanation:
From the given information of the question, Arrhenius acid and base concept is explained, from which a better term to define an acid and base is defined, known as The Bronsted-Lowry acid base theory.
According to The Bronsted-Lowry acid base theory -
An acid is the species which can readily donate a proton, where as, a base is the species, which can readily accept a proton.
Hence, the correct answer is as follow -
proton donar
proton acceptor
Answer:
proton donar
proton acceptor
Explanation:
what were the first 25 elements that found in the earth?
answer it plz.
Answer:
Copper, Lead, Gold, Silver, Iron, Carbon, Tin, Sulfur, Mercury, Zinc, Arsenic, Bismuth, Phosphorus, Cobalt, Platinum, Nickel, Magnesium, Hydrogen, Oxygen, Nitrogen, Barium, Chlorine, Manganese, Molybdenum, Tungsten.
Explanation:
Hope This Helps :b
Answer:
Vanadium
V
Chromium
Cr
Manganese
Mn
Aluminum
Al
Silicon
Si
Phosphorus
P
Sulfur
S
Chlorine
Cl
Argon
Ar
Potassium
K
Calcium
Ca
Scandium
Sc
Titanium
Ti
Lithium
Li
Beryllium
Be
Boron
B
Carbon
C
Nitrogen
N
Oxygen
O
Fluorine
F
Neon
Ne
Sodium
Na
Magnesium
Mg
The Concrete that surrounds a swimming pool takes less time to heat up than the water in the pool. Why
Answer:
The Concrete has a lower specific heat.
Explanation:
A. What do the four quantum numbers describe about an electron? (1 point)
B. Match each quantum number with what it defines about an electron's position
or energy. (2 points)
A. The first quantum number, n
B. The second quantum number, /
C. The third quantum number, m
D. The fourth quantum number, ms
___ Defines the electron's orbital
___ Defines the electron's energy level
___ Defines the electron's spin
___ Defines the electron's sublevel
Answer: Part A / The four quantum numbers tell you the location and energy of an electron.
Part B / _C_ Defines the electron's orbital
_A_ Defines the electron's energy level
_D_ Defines the electron's spin
_B_ Defines the electron's sublevel
A 4.00g sample of helium has a volume of 24.4L at a temperature of 25.0 C and a pressure of 1.00 atm. The volume of the helium is reduced to 10.4L, but the temperature and pressure of the gas are kept constant. What is the new quantity of the gas in moles
Answer:
0.852 mol
Explanation:
First we convert 4.00 g of helium (He) into moles, using its molar mass:
4.00 g ÷ 2 g/mol = 2 mol He
To answer this problem we can use Avogadro's law, which states that at constant pressure and temperature:
V₁n₂=V₂n₁
Where:
V₁ = 24. 4 Ln₂ = ?V₂ = 10.4 Ln₁ = 2 molWe input the data:
24.4 L * n₂ = 10.4 L * 2 molAnd solve for n₂:
n₂ = 0.852 molwhich one is more soluble C12H22O11 or MgCl2 and why?
Answer:
MgCl2
Explanation:
because of the salt containing Cl
How many atoms are present in 1.8 mol of Ca? Also, how many moles are in 3.4 * 10²⁶ molecules of H2O?
Answer: is this what your looking for?
Explanation: One mole of anything, no matter what the element is, is Avogadro's number, which is 6.02 * 10^23 atoms.
One mole of Calcium is equal to it's atomic weight in grams :
1 mole Ca = 40.08 g = 6.02 * 10^23 atoms
There is a 1000mg in a gram. 1000mg * 40.08g =
=40,080mg of Ca per mole
If you have 8.6mg of Ca that is 8.6mg / 40,080mg = .00021457 of a mole of calcium
so just multiply that by Avogadro's number to give you number of atoms:
.00021457 * 6.02 * 10^23 atoms = 1.292 * 10^20 atoms of Ca
A mole is the amount (10) of material containing [tex]6.02214 * 10^{23}[/tex] particles.
1 mol = [tex]6.02214 * 10^{23}[/tex] particles. This number is also called Avogadro's number
One mole of Calcium is equal to it's atomic weight in grams :
[tex]\text{1 mole Ca} = 40.08 g = 6.02 * 10^{23} \text{ atoms}[/tex]
a) 1g=1000mg
[tex]1000\text{ mg} * 40.08g = 40,080 \text{ mg of Ca per mole}[/tex]
If you have 8.6mg of Ca that is
[tex]\frac{8.6mg}{40,080mg} =0 .00021457 \text{ mole of Ca}[/tex]
In terms of Avogadro number:
[tex]0.00021457 * 6.02 * 10^{23} atoms = 1.292 * 10^{20} \text{ atoms of Ca}[/tex]
b) The number of moles of H₂O will be:
[tex]3.4*10^{26}*6.022*10^{23}\\\\20.47*10^{49} \text{moles}[/tex]
Learn more:
brainly.com/question/1358482
TRUE OR FALSE
All of the elements on Earth, except for hydrogen, were formed in the interiors of stars.
Answer:
True
Explanation:
I checked several websites to double check for you.
Answer:
Except for hydrogen and some helium created in the Big Bang, all of the stuff we, and the Earth around us, are made of, was generated in stars, through sustained fusion or in supernova explosions i thank its true :) hope this helps
72.2% of element X is mass number 85. 27.8% is mass number
87. What is the average atomic mass of element X? (Round to
the correct number of significant figures.)
Answer:
11
Explanation:
How many moles of oxygen
react with 37.5 moles of sulfur
dioxide in the production of sulfur
trioxide gas?
Answer:
1 L of O2 reacts with 2 L of SO2.
Explanation:
From the balanced equation, 1 mol of oxygen
reacts with 2 mol sulfur dioxide.
a compound is 43.7 phosphorus and 56.3 oxygen formula mass is 284 calculate emperical formula and molecular formula
Answer:
the molecular formula of a compound is P₄O₁₀.
M(P₂O₅) = 2 · Ar(P) + 5 · Ar(O) · g/mol.
M(P₂O₅) = 2 · 31 + 5 · 16 · g/mol.
M(P₂O₅) = 142 g/mol; molar mass of empirical formula.
M(PₓOₙ) = 284 g/mol; molecular mass of unknown compound.
M(PₓOₙ) : M(P₂O₅) = 284 g/mol : 142 g/mol.
M(PₓOₙ) : M(P₂O₅) = 2 : 1.
Explanation:
The empirical formula is [tex]P_{2}O_{5}[/tex] and The molecular formula is [tex]P_{4}O_{10}[/tex]
How to find the empirical and molecular formula? Convert each elements in grams to its amounts in moles.[tex](\frac{47.3g}{1})( \frac{1 mol}{30.97g})= 1.41 moles[/tex] of Phosphorus.
[tex](\frac{56.3}{1})(\frac{1 mol}{16}) = 3.51 moles[/tex] of Oxygen
Divide each resulting values by the smallest of these values.3.51/1.41 = 2.49 (rounded off 2.5)
1.41/1.41 = 1
Multiply these numbers with integers to get whole numbers.2.5 *2 = 5 (Oxygen)
2 *1 = 2 (Phosphorus)
Hence [tex]P_{2}O_{5}[/tex] is Empirical formula
and [tex]P_{4}O_{10}[/tex] is Molecular Formula
Learn more about Empirical and molecular formula here
https://brainly.com/question/13058832
#SPJ2
How do properties of water break down rocks?
Answer:
Explanation:
Freezing water can break rock without any change in the minerals that form the rock (physical weathering). This usually produces small particles and sand. Water with dissolved gases and other chemicals causes the minerals in rocks to be changed, leading to the deterioration of the rock (chemical weathering).
chemical weathering
Explanation:
freezing water when mix with it cause detorilation of rocks
Scientists developed a device capable of lowering temperatures in order to slow molecular motion to almost a complete stop. Which of these temperatures is theoretically able to make this happen?
0 K
0°C
273 K
273°C
Answer:
273k
Explanation:
Soooo... This is a complicated problem.
I dunno. Like... Is this a trick question? Trivia, maybe?
Nahhhhh...
It's just not telling us facts...SOME facts, but we need to use past learning to help us.
FIRST of all, what the heck does K even mean?
Is this a memo? A demo? A KO?
Okay, it's nither of these things.
So, let me tell you what the "K" means.
The K means "Kelvin" which is basically a word form for "-"
I AM NOT MAKING A FACE. IT'S THE WORD FORM FOR MINUS. STOP LAUGHING!!!!
And so... To bring objects to a COMPLEETE SKRRRRRRRRRRRRRRRRRRRRRRT...
It will need to be -273.
This means that the answer is 273k.
Which reminds me, Ima play 2k.
And ima rap to-day.
And now I'm being lame.
Just answer the question :/
A cough sytup contains 0.5M dextromethophan. How many moles of the cough supressant are in 21.3mL of the cough syrup?
Answer:
0.0107 mol
Explanation:
Multiply concentration by volume (in liters) to get moles.
0.5 M • 0.0213 L = 0.0107 mol
Select the correct answer.
What effect does an increase in products have on the reaction rate of a mixture at equilibrium?
A.
The forward reaction rate increases.
B.
Both the forward and the reverse reaction rates decrease.
C.
Both the forward and the reverse reaction rates increase.
D.
The reverse reaction rate increases.
Answer:
Both the forward and the reverse reaction rates decrease.i hope I help you to day and have a good day
If the volume of a gas is 1020 ml at 120°C and 1160 torr, what will the volume be at 20°C and 700 torr?
Answer:
1260 mL
Explanation:
Use formula (P1V1)/T1 = (P2V2)/T2
convert C to K
120 +273 = 393 K
20 + 273 = 293 K
plug numbers in
((1160)(1020))/ 393 = ((V2)(700))/ 293
solve for V2
V2 = 1260.187 mL
Explain the process of photosynthesis in a well-written paragraph containing complete sentences. Use all of the following words:
xylem
phloem
carbon dioxide
stomata
sunlight
water
oxygen
sugar
Answer:
Photosynthesis is the process takes place in green plants in which the plants convert the carbon dioxide and water into the sugar molecule and oxygen in presence of the sunlight. The sunlight is trapped by the chlorophyll pigment, carbon dioxide uptake is facilitated by the stomata present on the leaves in the epidermis.
The water moves from the roots to the leaves and stem where it is used for photosynthesis and transpiration. The movement of water is through the xylem and sugar is move through the phloem from the leaves to a different part of the plant for nutrition and further process.
Please Help ASAP!! Marking Brainliest!
Answer:
If they are pushing off the wall, it would be B, as they are going faster. If they are slowing down, it would probably be A, gradually getting slower.
Explanation:
definition of atomic number
The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. It is identical to the charge number of the nucleus. In an uncharged atom, the atomic number is also equal to the number of electrons.
Answer:
its basically represents the number of protons in the nucleus which in a neutral atom equals the number of electrons outside the nucleus and that determines the place of the element in the periodic table
Explanation:
sry i its too long
hope it helps
Which is the highest pressure?
a. 1.2 atm
b. 101 Pa
c. 101 kPa
d. 748 torr
How many different elements are involved in the reaction shown below?
2Fe + 6HC2H3O2 → 2Fe(C2H3O2)3 + 3H2
There are four. Fe, H, C, and O
How is saturn like earth In any ways?
Answer:
Its axis is tilted by 26.73 degrees with respect to its orbit around the Sun, which is similar to Earth's 23.5-degree tilt. This means that, like Earth, Saturn experiences seasons. Like Jupiter, Saturn is made mostly of hydrogen and helium.
Explanation:
Thats all I could think of, please mark brainliest
How many atoms of carbon are in diamond
Answer:
A diamond contains 5.0 x 10 21 atoms of carbon.
Given this balanced equation: CS2 + 3 O2 CO2 + 2 SO2
Calculate how many moles of SO2 can be produced with when given 4 moles of CS2.
58.67 g
Now calculate how many moles of SO2 can be produced with when given 4 moles of O2.
Which one is the limiting reactant (4 moles CS2 or 4 moles of O2)? How do you know?
Answer: The FitnessGram PACER Test is a multistage aerobic capacity test that progressively gets more difficult as it continues. The test is used to measure a student's aerobic capacity as part of the FitnessGram assessment. Students run back and forth as many times as they can, each lap signaled by a beep sound.
Explanation:
