Question

Predict whether the molar mass of magnesium would be determine to be lower of higher for each of the following occurrences (provide an explanation for each response)
a) The temperature of gas was higher than the temperature of the solution.
b) The pressure of the water column was not subtracted from the barometric pressure
c) The magnesium did not completely react with the hydrochloric acid
d) The oxide layer was not completely removed with sandpaper

Answer 1

D. if the oxide layer was not completely with sandpaper, magnesium oxide will also account for higher molar mass of magnesium .

C. if the magnesium did not completely react with the hydrochloric acid, then magnesium chloride and hydrogen gas formation will be less,

b. if the pressure of water column was not subtracted from the barometric pressure, then the measured pressure value includes atomspheric pressure, which results in increase in molar mass,

Absolute pressure=hydrostatic pressure+ atmospheric pressure.

a. Temperature affects the kinetic energy of the reaction. if the temperature increases, rate of formation of products increases, which increases molar mass of magnesium