Warm-Up 15 - Mass Percent of a Compound

Last updated about 1 year ago

3 questions

Note from the author:

Observed mass percent is using data from the lab.
Expected (theoretical) mass percent uses the known formula and molar mass.
Percent error formula is found on your cheat sheet.

Each of these questions has two blanks. The first blank is for the number and the second blank is for the unit.

Instructions

Observed mass percent is using data from the lab.
Expected (theoretical) mass percent uses the known formula and molar mass.
Percent error formula is found on your cheat sheet.

Each of these questions has two blanks. The first blank is for the number and the second blank is for the unit.

Using the data provided below, the mass of magnesium is _______ _______  and the mass of magnesium oxide is _______ _______. Based on these masses, the observed mass percent of magnesium in the compound magnesium oxide would be _______ _______. Make sure to put all numbers in 3.00 sig figs.

Based on the chemical formula, the theoretical mass percent of magnesium in magnesium oxide would be _______ _______. Round to a whole number.

The percent error for this experiment would be _______ _______. Round to a whole number. 