What is the mass number of 207pb ? a: 289 b: 207 c: 125 d: 82

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

What is the maximum amount of al2(so4)3 which could be formed from 15.84 g of al and 12.89 g of cuso4?

As changes in energy levels of electrons increase, the frequencies of atomic line spectra they emit