How many grams of copper (II) nitrate would be produced from 0.80 g of copper metal reacting with excess nitric acid?

What is a number added in front of a formula in order to balance the equation

What volume does 1.70 ×10–3 mol of chlorine gas occupy if its temperature is 20.2 °c and its pressure is 795 mm hg?

What does it mean for something to be dissolved in watera- it is submerged in water moleculesb-it is stirred in the water moleculesc- it is surrounded by water molecules d-it has water molecules added to it