Dimensional Analysis questions!?

Question

1) The largest lake of the Great Lakes, Lake Superior, which has a volume of 12,230 km^3.

What is this volume in liters (L)?

2) In a city with heavy automobile traffic, it is estimated that about 9.0 tons of lead exhausts are deposited on or near the highway everyday. What is this amount in kilograms per month?

(1 ton = 2000 lbs; 1 month = 31 days)

Answer 1

12,230 km^3  @ 1e9 m3 / km3  @ 1e3 litres / m3 =

your answer: 1.223e16 litres

2) In a city with heavy automobile traffic, it is estimated that about 9.0 tons of lead exhausts are deposited on or near the highway everyday. What is this amount in kilograms per month?

(1 ton = 2000 lbs; 1 month = 31 days

9.0 tons @ 2000 lbs / ton  @ 1 kg / 2.2046 = 8164.7 kilograms per day

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What is this amount in kilograms per month?

8164.7 kilograms /day  @ 31 day // month = 253105.7 kg / month

your answer (2 sig figs) :  250,000 kg / month ... (aka 2.5 e5 kg/month)