I need help solving this...

[Cofo]

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Calculate the mass of 2.75 x 10^22 molecules of C6 H5 NO2

it says the answer is 5.62 grams ??? I have tried and tried, but I still do not come up with 5.62 grams.

HELP PLEASE

 

[SugarNaCl]

Calculate the mass of 2.75 x 10^22 molecules of C6 H5 NO2

it says the answer is 5.62 grams ??? I have tried and tried, but I still do not come up with 5.62 grams.

HELP PLEASE

There are 6.02 X10 ^23 molecules in 1 mole of C6H5NO2. The mass of this is 123 g. If you set up an equation (1mole) (2.75x10^22) = (60.2x10^22)( x) solve for x = .046 mol. multiply 123g by .046 should give you the answer. I rounded so my answer was 5.66 but I think that's how you do it.

 

[jackbauer!]

?g = (2.75E22 molecules / 1) * (1 mol / 6.022E23 molecules) * (123 g / 1 mol) = 5.62 g

jb!🙂

 

[Cofo]

oooooh thank you so much guys. I very much appreciate the both of you for helping me! I tried 10 different times. AAAAAAAAAAAH! But I get it now, thank you.👍