I want to check my homework, so I'll give my question and tell you my answerYou will have to show your work to if my answer is wrong, so I know what I did wrong.1.218 X 10^38 1.218 multiplied to 10 to the power of 38How much would 3.45 X 10^22 atoms of Li weigh? I converted atoms to moles and moles to grams and got my answer [1.436787 X 10^47 grams]2) How many atoms of lithium is 1.00g of Li?I converted atoms to grams to moles and moles to atoms and got my answer [ 8.673101859 X 10^22 atoms]3) What is the mass of 9.45 mole of aluminum oxide?I found Valance electrons for both and switch way which got me Al2O3 and with a molar mass of 101.961 in totalI multiplied 9.45 by the molar mass and my answer was [963.53145 grams]
How much would 3.45 X 10^22 atoms of Li weigh? I converted atoms to moles and moles to grams and got my answer [1.436787 X 10^47 grams] Answer: I always advise my students to think about their answer and to try and conclude if the result is feasibleHave you any idea what you answer with 10^47g represents - The mass of the whole earth is 5.9742 × 10^24 grams - so your answer cannot be correct: You know that 1 mol of Li atoms has mass of 6.94g 6.02210^24 Li atoms has mass of 6.94g 3.4510^22 atoms must have mass: (3.4510^22)/(6.02210^23)6.94 0.398 g of Li 2) How many atoms of lithium is 1.00g of Li? I converted atoms to grams to moles and moles to atoms and got my answer [ 8.673101859 X 10^22 atoms] Answer: 6.94g Li has 6.02210^23 atoms Li 1 g Li has (6.02210^23)/6.94 8.6810^22 atoms In connection with the above two questions: have you heard of Avavgadro's number - 6.02210^23You seem to be doing a lot of converting to mols to grams toetc which is not necessary 3) What is the mass of 9.45 mole of aluminum oxide? I found Valance electrons for both and switch way which got me Al2O3 and with a molar mass of 101.961 in totalI multiplied 9.45 by the molar mass and my answer was [963.53145 gram Molar mass Al2O3 101.96 g/mol 9.45 mol 9.45101.96 963.5g You did this perfectly.
