N unknown mass of each substance, initially at 25.0 ∘C∘C, absorbs 1940 JJ of heat. The final temperature is recorded. Find the mass of each substance. a. Pyrex glass (Final temp= 55.6 ∘C)

Express your answer using two significant figures.

b. sand (Final temp= 62.3 ∘C)

Express your answer using two significant figures.

your picture is not part of the scientific method.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

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