Question

The balanced chemical equation for the reaction of hydrogen and oxygen is shown below. 2H2 + O2 mc002-1.jpg 2H2O The number of moles of hydrogen that is needed to produce? 0.253 mol of water is smaller than 0.253 mol. much greater than 0.253 mol. slightly greater than 0.253 mol. equal to 0.253 mol.

Answer 1

The required Balanced chemical equation is :

2H2 + O2 -----> 2H2O atomic mass of H-1 u atomic mass of O-16u molecular mass of Oxygen=32u molar mass of O2=32g

Molecular mass of Hydrogen= 2u molar mass of hydrogen=2g water molar mass=18g so 2H2 + O2 -----> 2H2O 2x2g of Hydrogen + 32g of O2 ----> 2x 18g of water 2moles of hydrogen reacts with

1 mole of oxygen to produce 2 moles of water 2moles of hydrogen -------->

2 moles of water X? ----------------------> 0.253mol of water = 2x0.253/2=0.253 mol of water ∴

The number of moles of hydrogen that is needed to produce 0.253 mol of water is 0.253 mol