You are given a sample containing 0.90 moles of a . a) how many atoms are in the sample if the substance is copper? . b) how many atoms are in the sample if the substance is silver? . c) how many molecules are present in the sample if the substance is benzene, c6h6? .

the answer is the first option

explanation:

just googled it m8. not that hard

lol

answer: any goods being imported from another country may be subject to issued by the federal government are tariffs

explanation:  

tariffs are a tax on anything that are imported from abroad. government use them to protect and boost their local industries and the thought is that they encourage consumers to buy local instead of importing and they will hope will protect jobs and economy in the country that implements them