Question

Need help don't understand this kind of stuff really well....

There are ____ mol in 50g of CaCO3

Answer 1

Assuming that you know what a mole is, use the formula:

\(\sf \large moles=\dfrac{mass ~(in~g)}{Molar~mass ~(in~g/mol)}\)

so you have to first find the molar mass of CaCO3 with the periodic table.

Answer 2

That's wat I'm lost about

Answer 3

for the molar mass of a compound, you add the molar of each individual atom in proportion to the number of atoms present.

So for example, water, \(H_2O\) has 2 H and 1 O

Molar mass of water= 2*(1 g/mol) + 1*(16 g/mol)= 18 g/mol

Answer 4

For your compound you have, 1 Ca, 1 C, and 3 O

Answer 5

Okay so what would the problem look like because I have to do 5 more like this.. And just what to say is thanks for your help

Answer 6

so you use the molar masses listed on the periodic table

\(\sf moles=\dfrac{50~g} {\underbrace{(40~g/mol)}_{Ca}+\underbrace{(12~g/mol)}_{C}+\underbrace{(3*18~g/mol)}_{O} }\)

Answer 7

oh wait O is 16 g/mol not 18 g/mol

Answer 8

Thanks because you explain it better than my teacher did and is is 61.25??

Answer 9

no problem (sorry for the late reply, i'm not receiving notifications)

and the answer would be much less than 61.25

\(\sf moles=\dfrac{50~g}{100~g/mol}=0.5~mol\)