54. How many moles of oxygen gas, O2, will react with 2 moles of nitrogen monoxide gas, NO, according to the following equation? ___ NO (g) + ___ O2(g) ____ NO2(g) [O2 = 32.00 g/mol; NO = 30.01; NO2 = 46.01] (A) 1 mol (B) 2 mol (C) 3 mol (D) 4 mol (E) none of the above

53. Salt A and salt B were dissolved separately in 100 mL beakers of water. The water temperatures were measured and recorded as shown in the table below: Salt A: initial water temp. 25.1°C final water temp. 30.2°C Salt B: initial water temp. 25.1°C final water temp. 20.0°C Which statement is a CORRECT interpretation of these data? (A) The dissolving of only salt A was endothermic. (B) The dissolving of only salt B was exothermic. (C) The dissolving of both salt A and salt B was endothermic. (D) The dissolving of salt A was exothermic and the dissolving of salt B was endothermic. (E) The dissolving of both salt A and salt B was endothermic.

54. How many moles of oxygen gas, O2, will react with 2 moles of nitrogen monoxide gas, NO, according to the following equation? _ NO (g) + _ O₂(g) ____ NO₂(g) [O₂ = 32.00 g/mol; NO = 30.01; NO₂ = 46.01]
(A) 1 mol
(B) 2 mol
(C) 3 mol
(D) 4 mol
(E) none of the above

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