Question

a student needs to determine the volume occupied by a gas in a 125 ml flask using the experimental setup described in the procedure. the student measures the volume of the flask to be 156 ml to the top of the flask. the student measures the volume of the flask with a stopper in it to be 135 ml. the student performs the experiment by reacting the strip of magnesium with 5 ml of hcl solution. what is the volume of the flask occupied by the hydrogen gas

Answer 1

The volume of the flask occupied by H₂ is 130 mL

Step-by-step explanation:

Given:

Volume total = 156 mL

Volume when stopper is used = 135 mL

If magnesium reacts with HCl, H₂ will be released and this gas will occupy the whole volume, thus, the volume of the flask occupied by H₂ is:

Volume occupied by H₂ = 135 - 5 = 130 mL