What mass of water has 6.70 x10^23 molecules?

Question

I keep getting 2.005e47 On my calculator but the answer key says 20 g .

6.70x10^23 molecuels *1 mol/6.02x10^23*18.02 g H2O /1 mol

That's how I set it up.

Answer 1

nah, 10^23/10^23 = 1
perhaps write it as

(6.70/6.02)(10^23/10^23) * 18.02