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What is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2? A(70.0 grams) B(90.0 grams) C(180.0 grams) C(800.0 grams)
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What is the mass of H2O produced when 10.0 grams of H2 reacts completely with 80.0 grams of O2?

A(70.0 grams)
B(90.0 grams)
C(180.0 grams)
C(800.0 grams)

User Brett Zamir
by
6.9k points

1 Answer

6 votes
H₂:

M=2g/mol
m=10g

n = m/M = 10g/2g/mol = 5mol

O₂:

M = 32g/mol
m = 80g

n = m/M = 80g/32g/mol = 2,5mol

2H₂ + O₂ ⇒ 2H₂O
2mol : 1mol : 2mol
5mol : 2,5mol : 5mol
10g : 80g : 10g+80g=90g

B
User FriedSaucePots
by
7.6k points
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