How many grams of hydrogen are needed to produce 1.80 g of water according to this equation?

Asked by maham237 @ 17/12/2020 in Chemistry viewed by 309 People

How many grams of hydrogen are needed to produce 1.80 g of water according to this equation? 2H2 + O2 → 2H2O
A) 0.100 g B) 0.180 g C) 0.200 g D) 2.00 g E) 4.00 g

Answered by maham237 @ 17/12/2020

Answer is c

Work out the moles of 2H2O: 1.80/ (16+1+1) = 0.1
The moles of 2H2 are the same (0.1)
The Mr of H2 is 2

So the mass needed to produce 1.80g of water is
0.1 x 2 = 0.2

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