Question

Explain why smog is more of a concern during hot summer months than cold winter months using this:

Nitrogen dioxide can be formed through the following process;
I. N2(g) + O2(g) + 90.29kJ <--> 2NO(g) Keq = 6.4 x 10-16 at 25C
II. 2NO(g) + O2(g) --> 2NO2(g) (fast reaction)

Not sure how to explain using equilibrium, thanks for helping. This is 12 Chemistry FYI.

Answer 1

Answer:

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Answer 2

Let cost price = x

If it is sold at 15% gain,

15% of x = x x 15/100 = 0.15x

selling price = x + 0.15x = 1.15x

If it is sold at 20% gain,

20% of x = x x 20/100 = 0.2x

selling price = x + 0.2x = 1.2x

$\sf \colorbox{gold}{{Given that }}$

1.2x - 1.15 x = 108 → 0.05x = 108 ⇒ x = 108/0.05 ⇒ x = Rs. 2160

Cost price is Rs. 2160.