Chemistry , solving a question

Question

If your front lawn is 23.0 feet wide and 20.0 feet long, and each square foot of lawn accumulates 1050 new snow flakes every minute, how much snow ( in kilograms) accumulates on your lawn per hour? Assume an average snow flake has a mass of 2.20 mg

Answer 1

This isn't really chemistry, but more to do with unit factor method, or dimensional analysis.

Total sq ft of lawn = L x W = 23.0 ft x 20.0 ft = 460. sq ft

Accumulation per minute = 1050 flakes/min/sq ft x 460 sq ft = 483,000 flakes/min

Accumulation per hour = 483,000 flakes/min x 60 min/hour = 28,980,000 flakes/hour = 2.898x10⁷ flakes/hr

kilograms per hour = 2.898x10⁷ flakes/hr x 2.20 mg/flake x 1 kg/10⁶ mg = 6.376x10¹ kg/hr = 63.8 kg/hr