How many moles of mgs2o3 are in 223 g of the compound

The diagram shows the positions of the sun, moon and earth during spring tides, when the high tides are at their highest and low tides at their lowest. what is it about these positions that causes these high and low tides?

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?