What is the answer for this thing below? and how you've done it.

How many grams of mgbr2 are needed to produce 75g or metal?

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

Draw a line graph showing the relationship between temperature in kelvin as a function of kinetic energy.