Perform the following conversions. Please circle your answer. You must show your work and report your answer with the correct number of significant figures to receive full credit.

Question

If 1 quirk equals exactly 6 squibs, and 1 squib equals 43.5 g, what is the mass of 245 quirks in pounds? 

Answer 1

1 quirk = 6 squibs

1 squib = 43.5 g

1 lb = 454 g

Using these conversion factors and dimensional analysis, we can find the mass (lbs) of 245 quirks.

245 quirks x 6 squibs/quirk x 43.5 g/squib x 1 lb/454 g = 140.848 lbs

(note how quirks cancel, squibs cancel and g cancel, leaving you with lbs)

Assuming that 1 quirk and 6 squibs are exact numbers, then we limit our answer to 3 significant figures based on 43.5 g/squib. So, our answer would be 141 lbs (to 3 sig. figs.)