# 2 Cl2(g) + C2H2(g) ‡ C2H2Cl4(l) How many liters of chlorine will be needed to make 75.0 grams of C2H2Cl4? Pressure: 1 atm Temperature: 298K

##### 1 Answer

You'd need **1, 1, 2, 2-tetrachloroethane**, under those conditions for pressure and temperature.

You've got your balanced chemical equation

Every time you must decide how much of something is needed to produce a certain amount of something else, you must look at the mole ratio between the two compounds.

In your case, **2 moles** of chlorine gas are needed to produce **1 mole** of tetrachloroethane, which implies that there's a

Use the mass of tetrachloroethane to determine how many moles were produced

The mole ratio then tells you that you need twice as many moles of chlorine for the reaction to produce that much product

You can determine the volume by using the ideal gas law equation,