How many grams of ethyl alcohol would be needed to produce 104.5 g of diethyl ether if the percent yield of reaction is 83.4 % ?

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.

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

Ab c or d ? i’m not sure what the answer is