Final answer:
To calculate the molar mass using the ideal gas law, rearrange the formula to n = PV/RT and use the formula m = M*n to find the molar mass of the gas. For calculating the percentage error, use the formula: percentage error = (experimental value - accepted value) / accepted value * 100%.
Step-by-step explanation:
To calculate the molar mass using the ideal gas law, PV = nRT, you need to rearrange the formula to n = PV/RT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. Once you have calculated the number of moles, you can use the formula m = M*n, where m is the mass and M is the molar mass, to find the molar mass of the gas. For calculating the percentage error, you need to compare the experimental value with the accepted value and express the difference as a percentage of the accepted value. The formula for percentage error is: percentage error = (experimental value - accepted value) / accepted value * 100%.