3. Given the following heats of formation. Calculate the heat of combustion of each compound in kJ mole-1. The product in each case
will be CO2 and H20.

(a) ethane, C2H -107 kJ mole
(b) acetylene, C2H2, +227 kJ mole
(c) benzoic acid, C7H6O -390 kJ mole​

im pretty sure its b

every chemical equation adheres to the law of conservation of mass, which states that matter cannot be created or destroyed. therefore, there must be the same number of atoms of each element on each side of a chemical equation.

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