The derived SI unit for pressure is Pa (pascals). Convert this to base SI units using the formula pressure = force/area.

Element X has the atomic symbol. How many neutrons are there in the nucleus?

What mass of gold contains 8.60 mol of Au?

The H-Cl bond length is 74.1 pm. Which of the following lengths is equivalent? Please select all that apply.

The balanced equation for the combustion of sucrose in a plentiful supply of air is: C₁₂H₂₂O₁₁ (s) + 12 O₂ (g) → 12 CO₂ (g) + 11 H₂O (l). What mass of oxygen is needed to react exactly with 50.0 g of sucrose?

22.50 g of potassium iodide was dissolved in water and the solution made up to 250 cm³. What is the concentration of the solution in mol dm^-3?

What is the oxidation state of Cr in K₂Cr₂O₇?

The combustion of propane-1,2-diol in a plentiful of supply of air is given by the following equation: W C₃H₆(OH)₂ (s) + X O₂(g) → Y CO₂ (g) + Z H₂O (l). What are the values of the stoichiometric coefficients W, X, Y, and Z?

Please select all that apply.

Calculate the mass of solid required to make up a 500cm³ bottle of sodium  hydroxide solution of concentration 2.0 mol dm^-3 solution.