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An unknown mass of each of the following substances, initially at 21.0 ∘C, absorbs 1930 J...

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Chemistry

An unknown mass of each of the following substances, initiallyat 21.0 ∘C, absorbs 1930 J of heat. The final temperature isrecorded as indicated. Find the mass of each substance.

1) Pyrex glass (Tf= 55.7 ∘C)

2) sand (Tf= 62.3 ∘C)

3) ethanol (Tf= 44.4 ∘C)

4) water (Tf= 32.4 ∘C)

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