Chemistry help with Avagadro's Number?

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need , answers , explanation of of these questions. chemistry teacher wasn't big help, i've turned online , couldn't find ways these. thanks.

1) calculate mass of 3.55 x 10^22 molecules of so3. use molar mass @ least many significant figures data given.

2) calculate mass of 2.50 x 10^20 molecules of n2h4

3) calculate mass of 7.45 1021 molecules of c6h12o6

i need , answers , explanation of of these questions. chemistry teacher wasn't big help, i've turned online , couldn't find ways these. thanks. 1) calculate mass of 3.55 x 10^22 molecules of so3. use molar mass @ least many significant figures the...


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