# ( This question is for any book ) HELPPPP PLEASE!! ( I will mark yall the brainliest if you answer it in a correctly way!! HELPPWhat kind of research did the author have to do in order to write the book??Explain.

###### Question:

( This question is for any book ) HELPPPP PLEASE!! ( I will mark yall the brainliest if you answer it in a correctly way!! HELPP
What kind of research did the author have to do in order to write the book??
Explain.

### A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube? A. 20.08 g B. 21.00 g C. 24.50 g D. 25.08 g E. 25.68 g Can anyone explain this one for me?

A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube? A. 20.08 g B. 21.00 g C. 24.50 g D. 2...

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