A practical joker adds table salt (NaCl) to a sugar( C12H22O11) container that originally held 5 kg of sugar. A chemist wishes to prepare a 1.5 molal solution of sucrose in water. He measures out the appropriate amount from the contaminated container to mix with 3.00 kg of water. His experiments do not seem to work. He later discovers that the percent carbon in 100 g of the solution is 12.10% by mass and consequently, determines that his solution is too dilute in sugar. What mass NaCl did the practical joker add to the container of sugar?