1.What is the modern standard for measuring atomic mass ?

2.CaCo3 Heat--CaO +Co2
   From the above equation calculate the amount of carbon dioxide in grams liberated by heating 25gms of calcium carbonate?

3. A student writes "preparation of Co2 in the laboratory in his book. From the point of view of chemistry what is the mistake made in this writing?

Carbon is taken as the standard for measuring atomic mass.
Kindly refer to the following link:

https://www.meritnation.com/ask-answer/question/why-is-carbon-taken-as-the-standard-unit-for-measuring-rela/atoms-and-molecules/3490406

Please ask the remaining queries in separate threads.

 

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