Question

10. Calculate to the correct number of significant figures 1. 9.00 - 3,000.00 + 3.970 2. 1.54 x 0.03060 x 0.69 3. 27.5 x 1.82 + 100.04 4. (1.10x10%)42.0x10') 11. A flask containing 9.55 mL of a liquid weighs 157.2 g with the liquid in the AA when empty. Calculate the density of the liquid in g/mL to the correct number of picant digits.

Answer 1

The highest significant number will be reference number in final answer. In 1) 3000.00 has 6 sig fig; in 2) 0.03060 has 4 sig fig; in 3) 100.04 has 5 sig fig; in 4) 1.10 has 3 sig fig

10)

1. 9.00 ÷ 3,000.00 ÷ 3.970 = 0.000755667

2. 1.54 x 0.03060 x 0.69 = 0.03251

3. 27.5 x 1.82 ÷ 100.04 = 0.50029

4. (1.10 x 10⁶) ÷ (2.0 x 10⁴) = 55.0

11)

weight of liquid = (weight of flask with liquid - weight of empty flask) = 157.2 g - 148.4 g = 8.8 g

volume of liquid = 9.55 mL

we know density = weight / volume = 8.8 g / 9.55 mL = 0.921 g / mL

density of liquid = 0.921 g/mL

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