How many molecules are in 2.91 X 1022 atoms of He

Explanation:

1 mole of oranges contains 6.02 x1023 oranges. 1 mole of helium gas contains 6.02 x1023 helium atoms. 1 mole of water contains 6.02 x1023 water molecules.

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25194.56

Explanation:

You'll  need a scientifuc calculator

2.91*10^22*1 = 2.91E22

2.91E22-/6.02*10^23=25194.56

6.02*10^22 Is the Mole number

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

hloride, what is the mass of calcium in

explanation: