7) A compound contains 70.8 percent silver. How many moles of silver does a 62.1 g sample contain ?
All statements are true except (a) density is a physical property. 1 mole of Ag would weigh approximately 107.87 g. Since the sample is 70.8% Ag then the 62.1 g sample would contain approximately 43.97 g of Ag. Dividing 43.97 by 107.87 gives you approximately .4076 moles of Ag. I hope your school lets you use calculators because those approximations are really difficult if you have to calculate them on paper. Hope I've helped. Thanks for the 2 points!
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