When an electric current is passed through a solution containing dilute tetraoxosulphate(VI) acid, 190 cm3 of hydrogen gas is evolved. If the measurements were made at

Kingsley Thompson August 10, 2025

 When an electric current is passed through a solution containing dilute tetraoxosulphate(VI) acid, 190 cm3 of hydrogen gas is evolved. If the measurements were made at

26°C and 736 mmHg. what is the volume of hydrogen at s.t.p.?
A. 164 cm'3
B. 168 cm'3
C. I79.1 cm'3
D. 201.5 cm'3
E. 546 cm'3
 
The correct answer is B. 168 cm'3.
SOLUTION: 
P1=736mmHg
V1=190cm3
T1=26+273K=299K
V2=?
At s.t.p.
T2=273
P2=760mmHg
Applying the general gas law equation
P1V1/T1=P2V2/T2
Make V2 the subject of formula
V2=P1V1T2/P2T1
V2=736mmHg*190cm'3*273K/760mmHg*273
V2=168cm'3
SOURCE: NECO CHEMISTRY 2001 QUESTION 10
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