According to the following thermochemical equation, what mass of ...

[gbarreiro]

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

[annierak]

Answer to Question 1

C

Answer to Question 2

C

[gbarreiro]

Gracias!

[kusterl]

TYSM