Problem: Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25 °C and 753 torr. What mass of hydrogen was collected? (Pwater = 24 torr at 25 °C)A. 0.00765 g B. 0.0159 g C. 0.0154 g D. 0.0164 g E. 0.159 g

FREE Expert Solution

We’re being asked to determine the mass of the 195 mL hydrogen sample collected over water at 25 °C and 753 torr.

At STP:         T = 0°C

                      P = 1 atm


We’re going to calculate the volume of the gas using the ideal gas equation.

PV=nRT

P = pressure, atm
V = volume, L
n = moles, mol
R = gas constant = 0.08206 (L·atm)/(mol·K)
T = temperature, K


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Problem Details

Small quantities of hydrogen can be prepared by the addition of hydrochloric acid to zinc. A sample of 195 mL of hydrogen was collected over water at 25 °C and 753 torr. What mass of hydrogen was collected? (Pwater = 24 torr at 25 °C)

A. 0.00765 g 

B. 0.0159 g 

C. 0.0154 g 

D. 0.0164 g 

E. 0.159 g

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Collecting Gas Over Water concept. If you need more Collecting Gas Over Water practice, you can also practice Collecting Gas Over Water practice problems.

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