How do you determine the volume of hydrogen collected at STP?

it was a reaction of magnesium with hydrochloric acid: Mg(s) + 2HCl(aq) ---> MgCl2(aq) + H2(g) values you may need: Volume of hydrogen gas (mL) = 48.3 ml STP = 22.4 L/mol room temperature = 22 degrees Celsius barometric pressure = 100.5 kPa water vapor pressure at 22 degrees Celsius = 2.60 kPa Mass of... show more it was a reaction of magnesium with hydrochloric acid:
Mg(s) + 2HCl(aq) ---> MgCl2(aq) + H2(g)

values you may need:
Volume of hydrogen gas (mL) = 48.3 ml
STP = 22.4 L/mol
room temperature = 22 degrees Celsius
barometric pressure = 100.5 kPa
water vapor pressure at 22 degrees Celsius = 2.60 kPa
Mass of Mg Ribbon (g) = 0.0500 g

thanks!
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