Hi everyone I've just got a few questions regarding some Chemistry stuff I've been doing out of my textbook (Year 11 Chemistry). We've been learning this in class, I thought I understood it, but I must be blacking out a little bit. 5) Calculate the mass of one atom of: a) Zinc Zn 65.4 AMU. In one mole of Zn there is 65.4g/ mol. How do I go from here? I thought it would've been something like 1 x 6.02x 10 (23), but that would show the amount of atoms in total, and if I'm trying to find the mass of one atom, how do I go about it? do I divide by the atomic weight? am I doing something wrong? Also, the molar mass and molecular weight, is that just the same as the mass of one mole of [whatever]? and... 10) What is the mass of: c) 6.24 x 10-2 mol hydrogen gas? H x 1 + 0 x 2 1 + 32 = 33 AMU. So in one mole of H02 there is 33g/ mol. 6.24 x 10-2 ------------- 33 Am I on the right path? Is Molecules the same thing as Atoms? I often get confused with moles and molecules, but understand they are 2 different things. 11) How many molecules are there in 7.0g of nitrogen gas, N2? How many nitrogen atoms are there in this sample? N x 2 14 x 2 = 28 AMU Therefore one mole of N2 has a mass of 28g/ mol. 7 -- 28 = 0.25 mol. 0.25 x 6.02 x 10 (23) Please point out if I'm doing anything incorrectly. I don't expect answers for the questions, as they aren't really homework questions, but I'd really like to know how to do them, as it's holidays and I haven't got a teacher handy. I've given all the questions a go, to the best of my ability and knowledge. Thanks so much.