.A 300 mL sample of hydrogen, H2, was collected over water at 21°C on a day when the barometric pressure was 748 torr. What mass of hydrogen is present?
The vapor pressure of water is 19 torr at 21°C.
a) 0.0186 g
b) 0.0241 g
c) 0.0213 g
d) 0.0269 g
e) 0.0281 g
