What is the mass of 0.78 mol Mg(NO3),? Make sure to round to the correct number of sig figs and to include the unit in your final answer

67.08 g

Explanation:

you firts write what u know

then u calculate the molar mass of the salt

then according to the formula mass= number of mols × molar mass you find the mass

m= mass

n= number of mol

M= molar mass i hope this helps

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons