Question

you analyze 100 Kg of gas in a tank and find the following: CO2:19.3% N2:72.1% O2:6.5% H2O: 2.1% what is the average molecular weight of the gas??

Answer 1

This is a step by step problem. I'm working on my English homework so I can;t give you the time to work it out completely but let me give you the steps:

1: Determine the weight for each gas. You have 100kg with percentages listed so we have 19.3kg of CO_2, 72.1kg of N_2 etc.

2: Now that you have the weight of each gas using the molecular weight, determine how many moles of each gas you have. weight gas * (moles / molecular weight).

3: Now that you have the moles for each gas, sum the moles to get the total number of molecules in moles. Times this number by avogadro's number (6.022 * 10^23).

4: This is the easy part. Divide 100kg (probably want to convert it into grams) and divide it by the number of molecules.