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SCIN 131 Suppose the density of Methene gas

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SCIN 131 Suppose the density of Methene gas

Methane gas, CH(g) , reacts with oxygen(g) to produce carbon dioxide gas and water vapor according to the equation: C2H4(g)  +  3 O2(g)     →   2 CO2(g)   +   2 H2O(g)

(a) How many milliliters of  ethene gas, C2H4 (g) and excess oxygen gas are needed to produce 55.5 L of carbon dioxide gas at STP ?

(b) Suppose the density of ethene gas  is 0.0155 g/cm3, how many grams of ethene are needed under these conditions?