Author Question: How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2(g) to ... (Read 88 times)

Chelseaamend · **on:** Aug 27, 2018

How much heat is absorbed/released when 20.00 g of NH3(g) reacts in the presence of excess O2(g) to produce NO(g) and H2O(l) according to the following chemical equation? 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(l) H = +1168 kJ

A) 342.9 kJ of heat are absorbed.
B) 342.9 kJ of heat are released.
C) 1372 kJ of heat are absorbed.
D) 1372 kJ of heat are released.

Question 2

Which of the following equations shows an incorrect relationship between pressures given in terms of different units?

A) 1.20 atm = 122 kPa
B) 152 mm Hg = 2.03 104 Pa
C) 0.760 atm = 578 mm Hg
D) 1.0 torr = 2.00 mm Hg
E) 1.00 atm = 760 torr