The following problem will slowly guide you through a work calculation. some questions may appear trivial, so trust your instincts and don't assume there are hidden tricks. the goal of such a guided exercise is to you picture the situation so you understand how all relevant variables change or stay the same. this is the first in a sequence of related problems. remember to use three significant figures for all numerical answers. the margin of error for each numerical answer is 5%. to avoid rounding errors use the unrounded intermediate values in your final calculations. let's assume the initial volume of the gas is 1.70 l the initial temperature of the gas is 27.0 degree c and the system is in equilibrium with an external pressure of 1.2 bar (given by the sum of a 1 bar atmospheric pressure and a 0.2 bar pressure due to a brick that rests on top of the piston). how many moles of gas are there in the container? what happens with the piston while you heat the gas?