Question

fill in the missing words
note to students: for molar mass values, use periodic table from the textbook. all answers must be reported with the correct number of significant figures.
one mole of zinc metal weighs grams. the molar mass of zinc is g/mol.
one mole of calcium metal weighs grams. the molar mass of calcium is g/mol.
one mole of nitrogen gas weighs grams (elemental nitrogen exists as a diatomic molecules). the molar mass of molecular nitrogen is g/mol.

Explanation:

Step1: Find molar - mass of zinc from periodic table

The molar mass of zinc (Zn) is 65.38 g/mol. One mole of any substance has a mass in grams equal to its molar - mass. So one mole of zinc metal weighs 65.38 grams.

Step2: Find molar - mass of calcium from periodic table

The molar mass of calcium (Ca) is 40.08 g/mol. One mole of calcium metal weighs 40.08 grams.

Step3: Find molar - mass of molecular nitrogen

Elemental nitrogen exists as $N_2$. The atomic mass of nitrogen (N) is 14.01 g/mol. For $N_2$, the molar mass is $2\times14.01 = 28.02$ g/mol. One mole of nitrogen gas weighs 28.02 grams.

Answer:

One mole of zinc metal weighs 65.38 grams. The molar mass of zinc is 65.38 g/mol.
One mole of calcium metal weighs 40.08 grams. The molar mass of calcium is 40.08 g/mol.
One mole of nitrogen gas weighs 28.02 grams. The molar mass of molecular nitrogen is 28.02 g/mol.