What is the gram-formula mass of Ca3(PO4)2 ? 1) 355 g/mol
2) 340. g/mol
3) 310. g/mol
4) 275 g/mol

3) 310 g/mol

Explanation:

Hello,

In this case, for calcium carbonate, we are able to compute its gram-formula mass by considering the atomic mass of each element composing it and their subscripts as shown below:

Thus, we compute:

Hence answer is 3) 310 g/mol . Remember this is also known as the molar mass of the mentioned compound.

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h let me think

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.