How many moles of calcium is 4.88 multiply by 10^23 atoms of calcium

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

For each of the following compounds, write the formula then predict whether it would be a strong, weak, or non-electrolyte when placed in di water. for the ionic compounds only, put (s) or (aq) after the forrmula formula strong, weak or non electrolyte? a calcium hydroxide b. silver carbonate c. lead(ii) sulfate d. phosphorus trifluoride e. sodium phosphide f barium sulfate g. strontium acetate h. zinc nitrate

Which diagram shows the correct way to represent an ionic compound of magnesium oxide?