What percent of hydrogen is present in a water molecule?

Sodium chloride is a common salt and has vast variety of applications. The molecular formula of sodium chloride is NaCl. The molar mass of NaCl is M_NaCl = 22.99 + 35.45 = 58.44 g mol⁻¹. What percent constitute sodium(Na) in a sodium chloride ions?

Acetone, also known as propanone, is a common solvent used in chemical industries. It is the smallest ketone, which is colourless, flammable liquid. The molecular formula of acetone is C₃H₆O.

The molar mass of acetone be M_C3H6O. What element in the composition of acetone constitute the highest percentage?

The presence of SO₂ in the atmosphere causes acid rain. What percentage of sulfur is present in SO₂ (molar mass = 64.07 g/mole)?

Ammomium nitrate (NH₄NO₃) has a molar mass of 80.06g/mole. It is a substance used to produce dinitrogen monoxide (N₂O). What is the mass percent of nitrogen in ammonium nitrate?

In cold areas, many fish and insects, including the common housefly, produce large amounts of glycerol (C₃H₈O₃ Molar mass = 92.11 g/mole) to lower the freezing point of their blood. What percentage of oxygen is present in glycerol?

What is the representative particle of ionic compounds?

The number of moles multiplied by Avogadro's number gives the number of particles.

Percentage composition of a compound tells you the percentage of the mass made up by each element in a compound.