1. For the year 2002, worldwide production of aluminum was24.4 million metric to

Question

1. For the year 2002, worldwide production of aluminum was24.4 million metric tons (t). In the right significant figures, (a) How many pounds of aluminum wereproduced?
(b) What was its volume in cubic feet (1 t = 1000 kg; d ofaluminum = 2.70 g/cm3)?
2. Round off thenumber to the indicated number of significant figures (sf). (a) 147000 (to 1sf)

(a) How many pounds of aluminum wereproduced?
(b) What was its volume in cubic feet (1 t = 1000 kg; d ofaluminum = 2.70 g/cm3)?
2. Round off thenumber to the indicated number of significant figures (sf). (a) 147000 (to 1sf)

(a) 147000 (to 1sf)

Explanation / Answer

1. (a) 24.4 million metric tons = 24.4x10^6 t          24.4 x10^6 t x (1000 kg)/1t x (2.2046 lb)/1 kg =5.38 x 10^10 lb     (b) 24.4 x 10^6 t x (1000 kg)/1t x (1000g)/1 kg x (1cm^3)/(2.70 g) x (3.5315 x 10^-5 ft^3)/(1cm^3)       = 3.19 x 10^8 ft^3 2. 147000 = 1 x 10^5

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