Calculate the mass, in grams, of each of the following.

Question

a) 1.2×10^23 gold atoms

b) 2.78×10^22 helium atoms

c) 2.0×10^23 lead atoms

d) 7.6×10^21 uranium atoms

Answer 1

There are 6.022 x 10^23 atoms in 1 mole; therefore, # moles = 1.2 x ^23/6.022 x 10^23 = ??
Then moles = grams/molar mass. Solve for grams.

Answer 2

A.) 65g
B.)0.187g
C.)79g
D.)3g