Find the average atomic mass of copper if 7 atoms out of 10 are copper-63 (70\%) and 3 atoms out of 10 are copper-65 (30\%)?​

You have 125g of a certain seasoning and are told that it contains 76.0 g of salt what is the percentage of salt by mass in this seasoning

Explanation for basic character?

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h