One atom of gold weighs 3.27 x 10-13 ng. how many gold atoms are in 1.0 g of gold?

How would you reduce the volume of gas

Suppose that during that icy hot lab 65,000 j of energy were transferred to 450 g of water at 20°c what would have have been the final temperature of the water

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.