The formula mass of calcium carbonate can be calculated using the formula and values from the data book and the mass is given in the question.

In what they've confirmed as the largest study looking at the effects of diet on rates of colon cancer, researchers in the UK ...

For example, the mass number of argon atoms and calcium atoms can both be 40. The atomic number of a chlorine atom is 17 and its mass number is 35. Calculate the number of protons, neutrons and ...