HF + NaOH ---> NaF + H2O If you need 1785 g of NaF (sodium Fluoride) how many grams of HF (hydrofluoric acid) do you need?

How many liters of ethylene glycol antifreeze (c2h6o2), with a density of 1.100 g/l, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to - 21.5°c? for water, kf = 1.86°c m -1.

The activation energy for the reaction no2(g)+co2(g)⟶no(g)+co(g) is ea = 300 kj/mol and the change in enthalpy for the reaction is δh = -100 kj/mol . what is the activation energy for the reverse reaction?

If you burn 46.6 g of hydrogen and produce 416 g of water, how much oxygen reacted