PLease help and please dont steal my points I really need help I love yall

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.