Forty percent of atoms of an element have a mass of 16 amu. sixty percent of atoms have a mass of 18 amu. What is the average atomic mass, in amu, of this element?

Solutions of sodium carbonate and silver nitrate react to form solid silver carbonate and a solution of sodium nitrate. a solution containing 3.50 g of sodium carbonate is mixed with one containing 5.00 g of silver nitrate. how many grams of sodium carbonate, silver nitrate, silver carbonate, and sodium nitrate are present after the reaction is complete?

What energy is it when you flip on a switch on a lamp

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold