A metal pellet with a mass of 100.0 g, originally at 116°C, is dropped into a cup of water, initially at 23.8°C. The final temperature is 46.3°C. What is the mass of the water in the cup? The specific heat
of water is 4.184 J/g.°C. The specific heat of the pellet is 0.568 J/g.°C.
A. 56g
B. 48g
C. 42g
D. 100g
E. 0.02g

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution.calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.