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3 years ago

What law does a balanced chemical equation demonstrate?

Chemistry

1 answer:

DochEvi [55]3 years ago

3 0

Answer:

The law of conservation of mass

Explanation:

A chemical equation is an expression of the net composition change associated with a chemical reaction. It shows how a certain amount of reactants yields a certain amount of products. Both of these amounts are measured in moles. Chemical equations often contain information about the state of the reactants: solid, liquid, gas, or aqueous. In addition, they always adhere to the law of conservation of mass, which holds that matter can change form, but cannot be created or destroyed.

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Please help with this , it’s very important

timurjin [86]

Explanation:

a) Cr is acid K is base

b) Ca is base and the other left part is acid

c)Ca is base and F2 is acid

d) NH4 is acid and SO4 is base

5 0

3 years ago

A reaction vessel for synthesizing ammonia by reacting nitrogen and hydrogen is charged with 5.79 kg of h2 and excess n2. a tota

PIT_PIT [208]

Answer:

82.08 %

Explanation:

The percent yield of the reaction = [(actual yield)/(calculated yield)] x 100.

Actual yield = 26.80 kg.

To get the calculated yield:

The balanced equation of reacting N2 with H2 to produce NH3 is:

N₂ + 3H₂ → 2NH₃

It is clear that 1.0 mole of N₂ reacts with 3.0 moles of H₂ to produce 2.0 moles of NH₃.

N₂ is present in excess and H₂ is the limiting reactant.

We need to convert the mass of H₂ added (5.79 kg) to moles using the relation:

n = mass /molar mass = (5790 g) / (2.01 g/mol) = 2880.6 mol.

We can get the no. of moles of NH₃ produced.

Using cross multiplication:

3.0 mole of H₂ produce → 2.0 moles off NH₃, from the stichiometry.

2880.6 mol of H₂ produces → ??? moles of NH₃.

The no. of moles of NH₃ produced = (2880.6 mol)(2.0 mol) / (3.0 mol) = 1920.4 mol.

We can know get the calculated yield of NH₃ = no. of moles x molar mass = (1920.4 mol) (17.00 g/mol) = 32646.76 g ≅ 32.65 kg.

∴ The percent yield of the reaction = [(actual yield)/(calculated yield)] x 100 = [(26.8 kg) / (32.65 kg)] x 100 = 82.08 %.

7 0

3 years ago

Answer the following question: In a space shuttle, the CO2 that the crew exhales is removed from the air by a reaction within ca

Ulleksa [173]

Answer:

See Explanation

Explanation:

The unbalanced reaction equation is;

CO2(g) + LiOH(aq) + Li2CO3(aq) + H2O(l)

The balanced chemical reaction equation;

CO2(g) + 2LiOH(aq) + Li2CO3(aq) + H2O(l)

The molar mass of each compound is the sum of the relative atomic masses of the atoms of the elements that compose the compounds.

For CO2

12 + 16(2) = 12 + 32 = 44 g/mol

For LiOH

7 + 16 + 1 = 24 g/mol

For Li2CO3

2(7) + 12 + 3(16) = 74 g/mol

For H2O

2(1) + 16 = 18 g/mol

From the balanced chemical reaction equation, the mole ratio is 1:2:1:1. This is obtained from the stoichiometric coefficient of each reactant in the balanced chemical reaction equation.

From the question;

1 mole of CO2 occupies 22.4 L

x moles of CO2 occupies 825 L

x = 1 mole * 825 L/22.4 L

x = 36.8 moles

From the reaction equation;

1 mole of CO2 produces 1 mole of water

36.8 moles of CO2 produces 36.8 moles of water

Mass of 36.8 moles of water = 36.8 moles * 18 g/mol

= 662 g of water

The answer must have three significant figures because that is the same number of significant figures to which values were given in the question.

6 0

3 years ago

Explain why two thin sweaters feel warmer then one thick sweater

jeyben [28]

Answer:

Two slender woolen sweaters are hotter than a thick woolen sweater in light of the fact that there is a layer of air between them that doesn't permit our body warmth to get away yet it likewise it doesn't retains heat from the climate and fleece is additionally a protector that itself doesn't permit our body warmth to get away

7 0

3 years ago

Displacement reaction between copper and silver nitrate solution produces silver and copper (II) nitrate solution. Write the che

xxMikexx [17]

Answer:

Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂

Explanation:

We are to give the reaction expression for this displacement reaction.

Reactants = copper and silver nitrate solution

Products = silver and copper (II) nitrate

Copper = Cu

Silver nitrate solution = AgNO₃

Silver = Ag

copper (II) nitrate = Cu(NO₃) ₂

So:

Cu + 2AgNO₃ → 2Ag + Cu(NO₃)₂

3 0

3 years ago