ninjas4life said:3. Use of the Data Booklet is relevant to this question.
Most modern cars are fitted with airbags. These work by decomposing sodium azide to liberate
nitrogen gas, which inflates the bag.
2NaN3 ---> 3N2 + 2Na
A typical driver’s airbag contains 50 g of sodium azide.
Calculate the volume of nitrogen this will produce at room temperature.
A 9.2 dm3 B 13.9 dm3 C 27.7 dm3 D 72.0 dm3
9 Which substance, in 1 mol dm–3 aqueous solution, would have the same hydrogen ion
concentration as 1 mol dm3 of hydrochloric acid?
A ethanoic acid
B nitric acid
C sodium hydroxide
D sulphuric acid
For the first Q...
Firstly calculate the no of moles of NaN3....n= m/Mr
..n= 50/(23+14*3)
= 0.769
and from the eqn...
2mol Nan3...gives...3 mol N2
1 mol Nan3 ..gives 3/2 mol N2
0.769 mol NaN3 gives....1.1535 mol N2
and in Room temp and pressure...
1 mol gas occupies 24 dm3 volume ..so 1.1535 mol gas occupies 24* 1.1535 = 27.7 dm3...So ans is C
..........................................
for 2nd Q
HCl is a strong monobasic acid and from the list select a strong monobasic acid
though ethanoic acid is a mono bacis acid it is not strong reject it...
Naoh is a base not an acid...reject it...
H2so4 is a strong acid but dibasic...
Hno3 is correct because it is strong and monobacis...So answer is B