Molar Mass and Atomic Structure

The video tutorial explains how to calculate the molar mass of nickel(II) chloride (NiCl2). It begins by identifying the atomic masses of nickel and chlorine from the periodic table. Nickel has an atomic mass of 58.69 grams per mole, and chlorine has an atomic mass of 35.45 grams per mole. Since there are two chlorine atoms in NiCl2, the chlorine mass is doubled. The total molar mass is calculated by adding the mass of nickel and the doubled mass of chlorine, resulting in 129.59 grams per mole. The video also discusses rounding differences based on periodic table precision.

What is the atomic mass of nickel as found on the periodic table?

• 35.45 grams per mole

• 12.01 grams per mole

• 58.69 grams per mole

• 63.55 grams per mole

How many chlorine atoms are present in nickel(II) chloride?

• One

• Two

• Three

• Four

What is the atomic mass of chlorine used in the calculation?

• 16.00 grams per mole

• 1.01 grams per mole

• 35.45 grams per mole

• 58.69 grams per mole

What is the total molar mass of NiCl2 as calculated in the video?

• 58.69 grams per mole

• 100.00 grams per mole

• 129.59 grams per mole

• 70.90 grams per mole

What might cause a slight difference in the calculated molar mass of NiCl2?

• Different periodic tables rounding differently

• Calculating the mass in kilograms instead of grams

• Using the wrong atomic mass for nickel

• Forgetting to multiply the chlorine mass by 2