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

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.