The "Set-Up" for the Problem "What Is the Mass, in Grams

Multiple Choice

The "set-up" for the problem "What is the mass, in grams, of 2.50 × 10²² atoms of Ca?" below is correct, except numbers in the last conversion factor have been replaced by the letters A and B. What are the numerical values of A and B, respectively?

A) 1 mole and 6.02 x 10²³ atoms
B) 40.08 g and 1 mol
C) 6.02 x 10²³ g and 1 atom
D) 40.08 mol and 6.02 x 10²³ atoms