27. In a nuclear power plant, the fuel rods contain about about __fissionable material.
A) 90%, 4% B) 90%, 90%
C) 4%, 4%
D) 4%, 90%

Can someone me with 3 and 4 plz. this is for masteries test.

What is the molar mass of ca(cio4)2

Which aqueous solution of ki freezes at the lowest temperature? 1) 1 mol of ki in 500. g of water 2) 2 mol of ki in 500. g of water 3) 1 mol of ki in 1000. g of water 4) 2 mol of ki in 1000. g of water