A4.98 g sample of aniline (c6h5nh2, molar mass = 93.13 g/mol) was combusted in a bomb calorimeter with a heat capacity of 4.25 kj/°c. if the temperature rose from 29.5°c to 69.8°c, determine the value of δh°comb for aniline. a) +7.81 × 103 kj/mol b) -3.20 × 103 kj/mol c) +1.71 × 103 kj/mol d) -1.71 × 103 kj/mol e) -7.81 × 103 kj/mol

Nitric acid can be formed in two steps from the atmospheric gases nitrogen and oxygen, plus hydrogen prepared by reforming natural gas. in the first step, nitrogen and hydrogen react to form ammonia: (g) (g) (g) in the second step, ammonia and oxygen react to form nitric acid and water: (g) (g) (g) (g) calculate the net change in enthalpy for the formation of one mole of nitric acid from nitrogen, hydrogen and oxygen from these reactions. round your answer to the nearest .