Oxides of nitrogen are pollutant gases which are emitted from car exhausts.

in urban traffic, when a car travels one kilometre, it releases 0.23 g of an oxide of nitrogen nxoy, which occupies 120 cm3.

what are the values of x and y?
(assume 1 mol of gas molecules occupies 24.0 dm3.)

a x = 1, y = 1

b x = 1, y = 2

c x = 2, y = 1

d x = 2, y = 4

The correct answer is option B.

Explanation:

Mass of ,m= 0.23 g

Molar mass of

Volume occupied by the

1 mol of gas molecules occupies 24.0 .

Then n moles of will occupy volume of .

n = 0.005 moles

Putting values from option A:  x = 1, y = 1

14 × 1+16× 1 ≠ 46

Putting values from option B:  x = 1, y = 2

14 × 1+16× 2 = 46  (The correct answer)

Putting values from option C:  x = 2, y = 1

14 × 2+16× 1 ≠ 46

Putting values from option D:  x = 2, y = 4

14 × 2+16× 4 ≠ 46

"standard molar enthalpy:

h2o ( liquid water ) : - 285.8 kj/mole

h2o ( water vapor ) : - 241.8 kj / mole.

δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0

answer: 44.0 kj"

they vary. it used to be meat, grain, bread, candy, beverages, donuts, and fruits/vegetables. now they added exercise in.