When chromium metal is added to nitric acid, the following reaction takes place Cr (s) + 6 HNO₃ (aq) → Cr(NO₃)₃ (aq) + 3 H₂O (l) + 3 NO₂ (g)
Calculate the volume of NO₂ gas (in L) collected over water at 40.0 °C when 11.1 g of chromium is added to excess nitric acid if the total pressure is 675.0 torr. The vapor pressure of water at 40.0 °C is 55.3 torr.

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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