How many grams of water are produced when 2.50 mol oxygen reacts with hydrogen?

Given:

2.5 mol O2

Required:

Grams of water

Solution:

2H2 + O2 -> 2H2O

Moles of H2O = (2.5 mol O2)(2 moles H2O/1 mole O2) = 5 moles H2O

Molar mass of H2O = 18.02 g/mol

Mass of H2O = (5 moles H2O)( 18.02 g/mol)

Mass of H2O =90.1g H2O

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"record the time to complete a chemical reaction" would most likely be part of a lab procedure.