Author Question: According to the following thermochemical equation, what mass of HF (in g) must react in order to ... (Read 72 times)

gbarreiro · **on:** Aug 27, 2018

According to the following thermochemical equation, what mass of HF (in g) must react in order to produce 345 kJ of energy? Assume excess SiO2.

SiO2(s) + 4 HF(g) SiF4(g) + 2 H2O(l) Hrxn = -184 kJ

A) 42.7 g
B) 37.5 g
C) 150. g
D) 107 g
E) 173 g

Question 2

In the production of an ester, the carboxylic acid loses which atom or group of atoms?

A) oxygen from the C=O
B) H from the OH group
C) the OH group
D) the entire COOH group
E) oxygen from the OH