Homework help. Answer please

Question

What is the mass (in grams) of 8,102,000 atoms of Potassium (K)?

You may enter your answer in either standard or scientific notation, but you must have the correct number of significant figures. Use * for multiplication and ^ for exponents.

Answer 1

8,102,000 atoms of Potassium (K) = 8.102x10⁶ atoms of K

convert this to moles:

8.102x10⁶ atoms of K x 1 mol K / 6.02x10²³ atoms of K = 1.346x10^-17 moles of K

convert this to grams of K using the atomic mass of K of 39.10 g / mol

1.346x10^-17 moles of K x 39.10 g / mol = 5.262x10^-16 gram of K