If you have 8.5 moles of water (H2O), how many grams of water do you have?

Alarge marble is dropped in a graduated cylinder with 35ml of water in it.the water level increases to 49ml.what is the volume of the marble

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.