Question

Please help!! I am so lost!!

calculate the number of moles in 100g each:

PbCl2

K2SO4

HNO3

CH3CH2OH

V2O5

Thankyou!!

Answer 1

mass(g) / molmass(g/mol) = moles

So, for each compound, find its mol mass and divide into 100g.

HNO3 has mass 1+14+3*16 = 63
So, 100g / 63g/mol = 1.59 moles

Suppose I told you to find the number of bean bags in 100 lbs. You'd first have to find out how much one bean bag weighs, then see how many times that goes into 100. Same thing here.

Answer 2

Thanks!!