Answer:
179g
Explanation:
Molar ratio for Copper : Lithium is
1:2
If there are 89.5g of copper
Grams for Lithium= 89.5 × 2 = 179g of Lithium
The amount of lithium are formed from the reaction if you begin with 89.5 grams of copper is 19.6 grams.
How do we convert mass into moles?Mass can be converted into moles by using the below equation as:
n = W/M, where
W = given mass
M = molar mass
Moles of 89.5g of copper = 89.5g / 63.5g/mol = 1.4 mol
Given chemical reaction is:
Cu + Li₂S → 2Li + CuS
From the stoichiometry of the reaction, it is clear that
1.4 mole of Cu = produces 1.4 mole of CuS
1.4 mole of CuS = produced by 1.4 mole of Li₂S
1.4 mole of Li₂S = produces 2×1.4=2.8 moles of Li
Mass of 2.8 moles of Li = (2.8mol)(7g/mol) = 19.6g
Hence resultant mass of lithium is 19.6g.
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What is temperature?
Answer: Temperature is an objective measurement of how hot or cold an object is. It can be measured with a thermometer or a calorimeter. It is a means of determining the internal energy contained within a given system.
Explanation:
Answer:
Temperature is a physical quantity that expresses hot and cold
Explanation:
Temperature is a physical quantity that expresses hot and cold. This is how the air feels and how hot/cold something is. The less tight the atoms are, the hotter something is. The more tight the atoms are, the cooler something is.
Exactly 5.00 L of air at -23oC is warmed to 27o What is the new volume in liters if the pressure remains constant?
Answer:
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How many atoms are in 20.4 g of beryllium
Which statement describes a physical property of copper?
Answer:
Copper is typically a solid and has a coppery, bronzy color. It is a metal and has a relatively high melting point. It has a strong luster and can conduct electricity.
Answer:
RESHAPE BY A FORCE.
Explanation:
1. It can be reshaped by a force. Physical property can be observed and measured without any changes in molecular composition.
2. A physical property is one that can be change without altering the identity of the substance. These set of properties is not concentration dependent they are use to describe matter. Example are: density, solubility, melting point and color and odor. For this case the second option seems to fit the description it can be reshape by force.
give a description of arecent (2018-2020) example of how this problem has displayed itself in your community
Answer:
im not sure go with the first
Explanation:
Amir observes Wave 1 and Wave 2 crashing into each other at two different intervals. His experiments produce Wave 3 and Wave 4. Amir records his data in a table.
A 2-column table with 4 rows titled Amir's Waves. The first column labeled Wave has entries 1, 2, 3, 4. The second column labeled Information has entries Amplitude of 6 centimeters, Amplitude of 4 centimeters, Amplitude of 7 centimeters, Amplitude of 3 centimeters.
What is the best statement about the data collected in Amir’s table?
Wave 3 resulted from destructive interference, and Wave 4 resulted from constructive interference.
Waves 3 and 4 resulted from constructive interference.
Waves 3 and 4 resulted from destructive interference.
Wave 3 resulted from constructive interference, and Wave 4 resulted from destructive interference.
Answer:
d
Explanation:
wave a and b clashing constructively would make c a bigger wave and clashing destructively would make d a smaller wave, which they are.
Answer:
d
Explanation:
Which product will precipitate in the following reaction:
CaCl2 + Na2CrO4 → CaCrO4 + 2 NaCl
A.NaCl
B.CaCrO4
C.Na2CrO4
D.CaCl2
Answer:
a
Explanation:
If 3.644 g (78.01 g/mol) is dissolved in 42.054 g of water and the temperature goes
from 27.8°C to 36.2°C, what is the molar Hrxn (kJ/mol)? Assume the solution has s
= 4.18 Hint: what is the mass of the entire solution?
g.°C
Answer:
[tex]H_{rxn}=-34.36\frac{kJ}{mol}[/tex]
Explanation:
Hello there!
In this case, according to the given information, it is possible to realize that the heat released by the reaction is used up to heat up the mixture, which means we can write:
[tex]-Q_{rxn}=Q_{sol}[/tex]
Whereas the Q of solution is given by the total mass (3.644+42.054), the specific heat of the solution and the change in temperature; thus, we obtain:
[tex]-Q_{rxn}=(3.644g+42.054g)*4.18\frac{J}{g\°C}*(36.2\°C-27.8\°C)\\\\ Q_{rxn}=-1604.55J[/tex]
Next, by computing the moles of the solute, we can proceed to compute the kJ/mol for the enthalpy of reaction (dissolution):
[tex]n=\frac{3.644g}{78.01g/mol}=0.0467mol\\\\H_{rxn}=\frac{Q_{rxn}}{n}\\\\ H_{rxn}=\frac{-1604.55J}{0.0467mol}*\frac{1kJ}{1000J}\\\\ H_{rxn}=-34.36\frac{kJ}{mol}[/tex]
Best regards!
The nucleus inside a eukaryotic cell has ________ that contains cell's DNA.
A. bacteria
B. chromosomes
C. electron
O D. hair
One liter of helium gas has a mass of 2.3 grams at STP. True or false
Answer:
n=V/Vm
n=1/22.4
n=0.044 moles He
m=n×M
m=0.044×4
m=0.178 g False
2. Water is an excellent solvent. With water being a polar
molecule, it can be an especially strong solvent for other
polar molecules. Give an example of how water acting as a
solvent is important for living organisms.
NO LINKS PLZ HELP
Answer:
Water acts as a solvent of carbon dioxide excreted from tissues, in blood and helps in regulating pH (because it forms carbonic acid that lowers pH when it tends to get higher). Blood pH should be maintained at about 7.4. One major reason is that the structure of protein is dependent ton pH because pH determines its ionization hence also affecting the charges and interaction between side groups of amino acids. A change in pH may, therefore, denature proteins and negatively affect cellular functions.
Explanation:
To get more on how water acts as a universal solvent check out brainly.com/question/7007192
In terms of percentages, what are the 3 biggest uses of natural gases?
1) Using Gas In The Home. In our homes, we end up utilizing the material every day.
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
Hope this helps. Btw, I love ur pfp!
Answer:
1) Using Gas In The Home. In our homes, we end up utilizing the material every day. ...
2) Use In The Industrial Sector. The industrial sector makes similar use of natural gas liquids as a fuel for process heating and raw material to produce chemicals, fertilizers, and hydrogen.
3) Transportation.
3. When looking at a potential energy graph, how do you know if a reaction is
exothermic or endothermic?
Answer:
The correct answer is -
if the potential energy of reactants is less than the potential energy then it is an endothermic reaction and if the potential energy of reactants is more than the products it is an exothermic reaction.
Explanation:
The potential energy graph represents the energy change in a reaction as it progresses. In the initial part of the reaction, the energy shows are the energy of reactants that takes part in the reaction, and in the later phase, the energy has represented the energy of products of the reaction.
To find the reaction if it is endothermic or exothermic one can see if the potential energy is increased or decrease with the progress of the reaction. if the reaction is increasing in energy with the progress then it is endothermic and exothermic in less energy.
Why is it expensive to bring electricity into urban areas?
Answer:
Power plants are not located in cities. Power has to travel a long distance over power lines to reach cities.
Explanation:
Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br. Group of answer choices Mg3Br2 Mg2Br3 Mg2Br MgBr2 MgBr
Answer:
MgBr2
Explanation:
(Mg^2+) + (Br^1-)
For every Mg we need 2 Br to balance out the compound.
Since magnesium has two outer electrons, it can donate one electron each to two bromine atoms having seven outer electrons in order for each of the atoms to have a complete octet.
Since the octet rule states that a stable atom must have eight electrons in its outermost shell, it follows that magnesium could give out two of its outermost electrons to two bromine atoms.
When that happens, each bromine atom which previously had seven electrons now have eight electrons, satisfying the octet rule. The correct formula of the compound is MgBr2.
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There is a bottle of KCl solution: the volume is 35 mL; its molarity is 3.0 M.
After diluting it into final volume 200 mL, what is the molarity (in M) now?
Answer:
0.525 M
Explanation:
As the problem deals with a dilution process, we can use the following formula:
C₁V₁=C₂V₂Where subscript 1 stands for initial concentration and volume, while 2 stands for the final conditions. Meaning that in this case:
C₁ = 3.0 MV₁ = 35 mLC₂ = ?V₂ = 200 mLWe input the data given by the problem:
3.0 M * 35 mL = C₂ * 200 mLAnd solve for C₂:
C₂ = 0.525 MPls help I need help ASAP!!! Be accurate
What happens to the solar energy absorbed by plants during photosynthesis ?
Answer:
Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. in plants involves a series of steps and reactions that use solar energy, water, and carbon dioxide to produce organic compounds and oxygen.
Explanation:
Answer:
its is used to make sugar which plants eat think it goes through like glycose or something
Explanation:
Given a volume of 47.8 mL of gas at STP, _______________ moles of O2 exist
When a chemical system is at equilibrium, A. the concentrations of the reactants are equal to the concentrations of the products. B. the concentrations of the reactants and products have reached constant values. C. the forward and reverse reactions have stopped. D. the reaction quotient, Picture, has reached a maximum. E. the reaction quotient, Picture, has reached a minimum.
Answer: The correct option is option B (the concentrations of the reactants and products have reached constant values).
Explanation:
CHEMICAL EQUILIBRIUM is defined as a state which is attained in a chemical system where by forward reaction occurs at the same rate with the backward reaction leading to CONSTANT CONCENTRATIONS of the reactants and the products. Chemical equilibrium is achievable in a closed Chemical system so that none of the reactants or products would escape be they gaseous or otherwise.
Chemical equilibrium occurs in a type of reaction called reversible reactions. Reversible reactions is one that can go in either direction depending on the condition of the system. In other words, reactants form products and under favourable conditions products react together to reform the reactants. For example,
3Fe(s) + 4H2O(l) <-------> Fe3O4(s) + 4H2(g)
As the above reversible reaction proceeds, a time is reached when the rate of forward reaction { which is the formation of Fe3O4(s) + 4H2(g)} is equal to the rate of the backward reaction {which is the formation of 3Fe(s) + 4H2O(l)}. At this point, concentrations of the reactants and products have reached constant values.
When a chemical system is at equilibrium then the concentrations of the reactants and products have reached constant values.
What is chemical equilibrium?Chemical equilibrium is a state occur in any reversible reaction, where the rate of forward reaction is equal to the rate of backward reaction and it is represent as:
A + B ⇄ C + D, where
A & B are reactants, and C & D are products.
As the rates are equal in equilibrium state, so the concentration of reactant and product also have constant value as there is no change in the rate.
Hence, option (B) is correct i.e. concentrations of the reactants and products have reached constant values.
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1. When there is light, photosynthesis can
A. occur, in the chloroplast.
B. not occur, and the stomata will not be open.
C. not occur, and the stomata will be open.
D. occur, in the
mitochondria.
Answer:
A
Explanation:
Answer:
A. occur, in the chloroplast.
Explanation:
Photosynthesis occur in chloroplasts, with the help of sunlight. Where mitochondria help in respiration
Fe2O3 + 3H2 → 2Fe + 3H20
About how many grams of H20 will be produced from 150 grams of
Fe2O3?
The mass of water will be produced from 150 grams of iron (III) oxide is equal to 50.7 g.
What is the balanced chemical equation?A chemical equation depicts a chemical reaction in terms of symbols of the substances. A chemical equation consists of reactants participating, products, and their physical states.
The law of conservation of mass should be followed by a balancing of a chemical equation so that the number of atoms of substances is equal on either side of the equation is a balanced chemical equation.
Given the balanced chemical equation of the reaction of iron oxide and hydrogen:
[tex]Fe_2O_3 + 3H_2 \longrightarrow 2Fe + 3H_2O[/tex]
Given, the mass of the iron oxide = 150 g
The number of moles of iron oxide = 159.69 g/mol
The number of moles of iron (III) oxide = 150/159.69 = 0.939 mol
One mole of iron (III) oxide produces water = 3 mol
Then 0.939 mol of iron (III) oxide produces water = 3 ×0.939 = 2.82 mol
The mass of water produced = 2.82 ×18 = 50.7 g
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What is the elevation of Point B?
A. 800 ft
B. 900 ft
C. 850 ft
D. 1000 ft
One peanut M&M weighs approximately 2.33 g.
A. How many peanut M&Ms are there in 53.768 kg of M&M's?
Answer:
There are 23076 peanut M&M's in 53.768 kg of M&M's.
Explanation:
First we convert 53.768 kg into g:
53.768 kg * 1000 = 53768 gThen we divide the total mass of M&M's by the mass of one peanut M&M, in order to calculate the answer:
53768 g / 2.33 g = 23076So there are 23076 peanut M&M's in 53.768 kg of M&M's.
the color of an object that absorbs all colors except red
Answer:
The color black absorbs most colors, while white reflects most colors.
what evidence Have you collected to explain The relationship between the seafloor Ready mid ocean ridges and ocean trenches
Answer:Abundant evidence supports the major contentions of the seafloor-spreading theory. First, samples of the deep ocean floor show that basaltic oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached, and the sediment cover is thinner near the ridge.
Explanation:
Please help with this one
Answer:
15g
Explanation:
hope this helped
explain the general properties of group 1 elements in relation to their electronic configuration
Answer:
The elements in Group 1 (lithium, sodium, potassium, rubidium, cesium, and francium) are called the alkali metals. All of the alkali metals have a single s electron in their outermost principal energy. ... For example, the electron configuration of lithium (Li), the alkali metal of Period 2, is 1s22s1.
Answer:
they have a mono positive charge of +1
Explanation:
this is due to having one electron in their outermost ns orbital
What is the cation in KF?
Answer:
K, or Potassium
Explanation:
What is the pressure inside a container of 3 moles of gas with a volume of 60 Liters at a temperature of 400 K?
I just need the answer not a link please :)
