Hydrogen gas (H2) and iron (111) oxide powder react to form liquid water and solid iron powder

What is the molarity of the solution produced when 145 g of nacl is dissolved in sufficient water to prepare 2.75 l of solution?

A155.0 9 piece of copper at 182 °c is dropped into 2500 g of water at 23.9 °c. (the specific heat of copper is 0.385 1/9°c.) calculate the final temperature of the mixture. (assume no heat loss to the surroundings.)

What would happen if no were added to n(g)+o2=2no(g) at equilibrium?