Helppp, its equation balancing!
the answer is C but how?

If 1.8 l of water is added to 2.5l of a 7.0 m koh solution, what is the molarity of the new solution

What substance has a mass of 9.5g and volume of 2.1cm^3

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.