Thread: Atoms to Grams

Hi, sry again -_- but i have yet another question.. what am i doing wrong!?

im trying to convert Atoms to Grams. EXample

1.0×1023

so im doing

(1.0×1023 )(1/6.022x10^23)(196.
96655)=3.3g (putting it to 2 sig figs.)

same thing for 2.80×1022

im doing (2.80×1022 )(1/6.022x10^23)(4.002602)=1.9


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last but not least can you guys help me get an idea of how to do this problem i think i know how but want to verify.

How many helium atoms are there in a helium blimp containing 535 of helium?

so i would start off by puting 535 into grams (535000g)then divide by molar mass then multiply by avogadro = atoms (8.0*10^28)

Originally Posted by Nismo

Hi, sry again -_- but i have yet another question.. what am i doing wrong!?

im trying to convert Atoms to Grams. EXample

1.0×1023

so im doing

(1.0×1023 )(1/6.022x10^23)(196.
96655)=3.3g (putting it to 2 sig figs.)

same thing for 2.80×1022

im doing (2.80×1022 )(1/6.022x10^23)(4.002602)=1.9


______________________________

last but not least can you guys help me get an idea of how to do this problem i think i know how but want to verify.

How many helium atoms are there in a helium blimp containing 535 of helium?

so i would start off by puting 535 into grams (535000g)then divide by molar mass then multiply by avogadro = atoms (8.0*10^28)

I'd use the mole as an intermediate step, that is divide by Avogadro's constant and then by the relative atomic mass.






You appear to be an order of magnitude out by my answers, check your powers of 10?
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2. Yep

1) I see what you did for the 1st problem, but i cant seem to use that method when doing

7.4×1021 or 2.80×1022





2) Also is the answer going to be 8 atoms or the 8.049x10^24?? (because i would have to round this to 4 sig figs since the 6.022 is 4 sig figs and since im dividing with if that makes sense?