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

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.

If 10.5 l of a at 0.98to 1.50 , is ?