Question from my homework. I'm not exactly sure what I am doing wrong, and it is bugging me. I hope this post is in the right forum. Imagine that 9.9 g of liquid helium, initially at 4.20 K, evaporate into an empty balloon that is kept at 1.00-atm pressure. What is the volume of the ballon at the following? (a) 23.0 K (b) 299 K After missing the question, help was given, but I can't make sense of it: Apply the ideal-gas law to find the volume of the gas at 4.2 K, and a fixed amount of gas to find its volume at the given temperatures.