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maks197457 [2]
3 years ago
12

The electrolysis of water forms H2 and O2.

Chemistry
2 answers:
Goshia [24]3 years ago
6 0

the answer is D. 67.6%

Kobotan [32]3 years ago
3 0
1) Chemical equation

2H2O ----> 2H2 + O2

2) theoretical molar ratios:

2 mol H2O : 2 mol H2 : 1 mol O2

3) determine the number of moles in 17.0 g of H2O and 10.2 g of O2

number of moles = mass in grams / molar mass

molar mass of H2O = 18.02 g/mol

molar mass of O2 = 32.00 g/mol

=> number of moles of H2O = 17.0 g / 18.02 g/mol = 0.943 moles

number of moles of O2 = 10.2 g / 32.0 g = 0.319 mol O2

4) theoretical yield

2 mol H2O / 1 mol O2 = 0.943 mol H2O / x =>

x = 0.943 mol H2O * 1 mol O2 / 2 mol H2O = 0.472 mol O2

5) Percent yield

Percent yield = (actual moles / theoretical moles) * 100 = (0.319 / 0.472)*100 = 67.6%

Answer: the fourth option 67.6%
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Explanation:

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There are no specific equations but here what i can give you:

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In all synthesis reactions, there is a single product that is a compound!

2. Decomposition -- A decomposition reaction is a chemical change in which a single compound breaks down into two or more simpler products. (This is the opposite of synthesis reactions!)

Most decomposition reactions require energy in the form of heat, light, and electricity.

3. Single Replacement -- A single-replacement reaction is a chemical change in which one element replaces a second element in a compound. You can identify a single-replacement reaction by noting that both the reactants and the products consist of an element and a compound.

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5. Combustion -- A combustion reactions is a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat or light.

A combustion reactant always involves oxygen as a reactant. (If the supply of oxygen is limited, then the combustion will not be complete.)

The other reactant is a hydrocarbon, which is a compound composed of hydrogen and carbon and the complete combustion of a hydrocarbon produces CO2 and H2O.

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I really hope this helps you!

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