Number of H in 3(NH4)2CrO4

Which mathematical relationship should you us to convert moles of a substance into grams

What is the number of atoms in 3.54 mol s

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm