6 volumes of helium diffuses pinhole in 10s. Equal volume if unknown gas diffuse 40s. Find molar mass of unknown gas? How to calculate this?​

What happened in 2012 and how does it illustrate the importance of understanding the sun and how it works?

0.09 moles of sodium sulfate in 12 ml of solution

Select the correct text in the passage. which sentences describe examples of sustainable living? i live in an old apartment building downtown, but my company is based in an office park on the outskirts of the city. i drive an old car that needs to be replaced. i plan to buy a hybrid for better gas mileage, but for now i am able to carpool with a couple of friends from work. the drive to the office park is about 45 minutes each way, but we do get to work in a modern building. the architects just received a leed certification for the design.