Chemistry in senior one is about the molar mass and the number of molecules, atoms, electrons and protons. The molar mass of matter, and the molar mass of gas, and how to calculate these, formula.

Hello, if O2 is taken as an example, when the amount of oxygen substance is 1mol, according to N=n*NA, its molecular number is 6.02 * 10 23.

Then it contains two atoms in a molecule, so its atomic number is 1.204 * 10 24.

The numerical value of the molar mass of a substance is actually equal to its relative atomic mass or relative molecular mass, so the molar mass of oxygen is 32g/mol, which can be obtained according to m = m = m=M*n n n.

Find the volume under standard conditions, the molar volume of each gas is 22.4L/mol, and the volume can be obtained according to V=n*Vm.

Find electrons and protons. The number of electrons is actually equal to the number of protons, atomic numbers and nuclear charges of an element, so the number of charges carried by O2 is 8*2= 16.

I hope the landlord can recite these formulas, and the more you learn, the better! ! Hope to adopt!

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