The equation for the formation of water from hydrogen gas and oxygen gas is 2H2+O2→2H2O. How many grams of water can be made from 160 g of oxygen gas?

160 g

180 g

320 g

405 g

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount