My Teacher gave us homework, but im still having some trouble getting to the answeres, she gave us the answers ( she just to see the work) but I cant seem to get the right answer ( the answer is 8.36x10e3) can someone help show me hoe to get it ( we also have to use significant figures and round but i just want to know how to get to the answer)
Your question is not complete. You have 5.03 *10^21 atoms of Copper? and Answer is 8.36 * 10^3. Can you be more specific like the moles, molar mass. Can you please type the question given to you by your teacher! Edit: Ok! You know 1 mole = 6.02*10^23 atoms So using the conversion 1 mol / 6.02*10^23 atoms 5.03 * 10^ 21 atoms of Copper * 1 mol / 6.02 *10^23 atoms of Copper 8.36 * 10 ^ -3 moles of Copper. Now i actually understand your question. See when you press e in the calculator it is already assumed to be 10 . So if your typing 6.02*10^ 23 in calculator just put 6.02 e 23 and it should shoud be done. e in calculator is 10^ . So what you would do is type like this in your calculator 5.02 e21 / 6.02 e23 and then you will get your answer maybe as 0.0083554817 but you need just 3 sig figs. so you can write either as 0.00836 or some calculators give you as 8.3554817 e-3 . So dont worry. just remember not to add that 10 after you entered the e. Just add the power and you should be fine! Hope it helps! Good luck! Reply back if its still confusing you!
The question would appear to be How many moles are in 5.03 x 10^21 atoms of copper?, but the answer you give is wrong. The answer is 8.35 x 10^ -3 not 8.36 x 10^3 The number of atoms in 1 mole is 6.023 x 10^23 atoms/mole The number of atoms you have is 5.03 x 10^21 atoms The number of mole of copper is 5.023 x 10^21 atoms / 6.023 x 10^23 (atoms/mol) = 8.35 x 10^ -3 mol
