Question

hydrogen and oxygen react to produce waterHow many grams of hydrogen will be required to react with 5.35 x 10^25 molecules of oxygen?

Answer 1

Step 1

The reaction must be written, completed, ad balanced:

2H2 + O2 = 2H2O

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Step 2

Avogadro's Number will be used here and it states that:

1 mole of substance = mass of the substance = 6.02x10^23 formula units (molculesin theis case)

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Step 3

Information needed:

Mass per mole of H2 = 2.01 g

Information provided:

5.35x10^25 molecules of O2

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Step 4

Procedure:

2 x 2.01 g H2 ------- 6.02x10^23 molecules O2

X ------- 5.35x10^25 molecules O2

X = 5.35x10^25 molecules O2 x 2 x 2.01 g H2/6.02x10^23 molecules O2

X = 357.3 g H2

Answer: 357.3 g H2