The new volume is 41 mL.
Explanation:
Use the combined gas law
P
1
V
1
T
1
=
P
2
V
2
T
2
.
STP=273.15 K and 1 atm
Given/Known
P
1
=
0.90 atm
V
1
=
50.0 mL
T
1
=
298 K
P
2
=
1 atm
T
2
=
273.15 K
Unknown
V
2
Solution
Rearrange the equation to isolate
V
2
and solve.
P
1
V
1
T
1
=
P
2
V
2
T
2
V
2
=
P
1
V
1
T
2
T
1
P
2
V
2
=
0.90
atm
×
50.0
mL
×
273.15
K
298
K
×
1
atm
=
41 mL
