The atomic mass of hydrogen-1 is 1. 008 and the atomic mass of helium-4 is 4. 3. Find the difference in grams between 4 moles of hydrogen and one mole of helium.

When amy exercises in her fitness center for 1 hr she burns a total of 475 calories.if she burns 9 calories a minute jogging on the treadmill and then burns 6.5 calories a minute pedaling on the stationary bicycle how many minutes of the hour does she spend exercising on the bicycle?