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how many grams are there in 7.15 x 10^24 molecules of water

a) 11.88 g
b) 214.02 g
c) 0.66g
d) 1.29x10^26 g
e) 3.97x10^23 g

2 answers

you have 7.15x10^24 / 6.02x10^23 = 11.88 moles of H2O
Now just convert that to grams
There are 6.02E23 molecules in 1 mole of water.
mols H2O = 7.15E24/6.02E23 = 1.19E1 = 11.9
grams = mols x molar mass = ?
Whoever gave you those choices hasn't looked at the number of significanat figures. The answer have more than allowed.
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