Question

How do I determine the pressure of the 'wet' hydrogen gas and the pressure of hydrogen gas on its own? Do i use Dalton's law?

Answer 1

Room temperature (°C) 22.0
Barometric pressure (kPa) 100.5
Water vapor pressure at 22 °C (kPa) 2.60
Mass of Mg ribbon (g) 0.0500
Volume of hydrogen gas (mL) 48.3

Observations of reaction • when the Mg came into contact with the HCl bubbles of gas (H2) were produced
• the H2 produced displaced the water in the graduated cylinder

Answer 2

You have to use partial pressures!