Can someone explain to me one or more of the following...
1. Normal Saline, which is a 0.85% solution of sodium chloride in water (0.85g of solute per 100g of water.) What is the molar concentration of normal saline?
2. A current of 1.00A passes for 96.5 hours through molten anhydrous calcium chloride. What is the mass of calcium deposited?
3. A excess of magnesium carbonate was added to 50.0cm^3 of 1.00mol/dm^3 sulphuric acid. Calculate:
a) the mass of magnesium carbonate that reacted
b) the volume at r.t.p. of carbon diocide evolved.
...My chemistry exam is tomorrow... I am on my knees for help...