The reaction of hydrogen with oxygen produces water. 2H2( g )+O2( g )2H2O( g ) A- How many moles of O2 are required to react with 3.8 mol of H2 ?

The reaction of hydrogen with oxygen produces water. 2H2(g)+O2(g)→2H2O(g)
A-How many moles of O2 are required to react with 3.8 mol of H2 ?
Express your answer to two significant figures and include the appropriate units. 
B-How many moles of H2 are needed to react with 4.1 mol of O2 ?
Express your answer to two significant figures and include the appropriate units.
C-How many moles of H2O form when 4.0 mol of O2 reacts?
Express your answer to two significant figures and include the appropriate units. 

 

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