How do you determine the total mechanical energy stored of an object

What is the chemical formula of the following compound

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate