Homework Help: chemistry

Posted by Mely on Friday, September 10, 2010 at 12:08am.

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

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

chemistry - DrBob222, Friday, September 10, 2010 at 12:16am
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.

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