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  • 04-01-2016
  • Chemistry
Answered

what is the mass of 9.0 x 10^17 molecules of He gas at STP

Verified Answer :

Billymkhoi
Billymkhoi Billymkhoi
  • 04-01-2016

(9.010^17 He molecules) (1 mol He/ (6.0210^23 He molecules))= 1.510^(-6) mol He.

1.510^(-6) mol He (4.00 g He/ 1 mol He)= 6.010^(-6) g He.

The mass of 9.010^17 He molecules at STP is 6.0*10^(-6) g He~

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