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प्रश्न
If the density of a solution is 3.12 g mL–1, the mass of 1.5 mL solution in significant figures is ______.
विकल्प
4.7 g
4680 × 10–3 g
4.680 g
46.80 g
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उत्तर
If the density of a solution is 3.12 g mL–1, the mass of 1.5 mL solution in significant figures is 4.7 g.
Explanation:
Density of a solution = `"Mass of solution"/"Volume of solution"`
3.12 g mL–1 = `x/(1.5 mL)`
∴ `x = 3.12 xx 1.5`
`x` = 4.68 g
The number of significant figures in the product of a multiplication or division should equal the number of figures in the calculation's least precise phrase. This term's degree of precision is 1.5.
As a result, the needed response should include two significant figures.
4.68 g, for example, should be rounded up to 4.7 g.
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