ManzRDH

Dinene RDH, BA
10+ Year Member
15+ Year Member
Sep 9, 2003
50
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New York
Can someone explain the steps for this:

Water is formed by adding 4.0g of H2(g) to and excess of O2(g). If 27 grams of H2O are recovered what is the % yield for the rx?
A- 25%
B-50%
C-75%
D-100%
E- cannot be determined from the info

Thanks for your help
 

HuyetKiem

Senior Member
10+ Year Member
15+ Year Member
Apr 16, 2004
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Texas
Status
  1. Dentist
ManzRDH said:
Can someone explain the steps for this:

Water is formed by adding 4.0g of H2(g) to and excess of O2(g). If 27 grams of H2O are recovered what is the % yield for the rx?
A- 25%
B-50%
C-75%
D-100%
E- cannot be determined from the info

Thanks for your help

2H2 + O2 --- > 2H2O
4g of H2 would yield 36g of water

But in you case, only 27g of water are recovered. So the % yield for the rx is:
27/36 = 75%
 

ManzRDH

Dinene RDH, BA
10+ Year Member
15+ Year Member
Sep 9, 2003
50
0
New York
HuyetKiem said:
2H2 + O2 --- > 2H2O
4g of H2 would yield 36g of water

But in you case, only 27g of water are recovered. So the % yield for the rx is:
27/36 = 75%
thank you for your help
 
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