Calculate the following quantities :


a- mass in grams , of 1.906*10^-2 mol BaI


b- number of moles , of NH4Cl in 48.3g of this substance


Could you help me to solve this problem ?

One mole of any substance will be equal to the relative molecular mass, in grams. I won't do your question, just be giving you an example. I'm not supposed to do your work.

Mr of CO2 = 12 + 16 + 16 = 44
Therefore, 1 mol of CO2 will have a mass of 44g.

And 2 moles will have 88g, 3 moles 132g, etc.

For your first question, find the Mr of BaI. That will be the mass for 1 mol. Find the mass, by proportion, the its mass for 1.906x10^-2 mol.

And the reverse for your second question.

Thanks Jerry for your helping

You're most welcomed:). Feel free to ask for any more questions!