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A 25 mL sample of matter has a density of 7.9 g/ml., What is the mass of the substance?

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Answer:

197.5 grams

Step-by-step explanation:

To find the mass (g) of the sample, you need to multiply the given volume (mL) by the denisty. You can use the denisty to convert between mL and g because the denisty is a ratio which represents the mass of the sample per every 1 mL. The ratio should be arranged in a way that allows for the cancellation of units (mL should be in the denominator).

Denisty = 7.9 grams/ 1 mL

25 mL 7.9 grams
----------------- x ---------------------- = 197.5 grams
1 mL

**The final answer is not written with the proper sig figs.

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