Chemical formulae, equations and calculations

Hydrazine ( $N2H4\text{N}_2\text{H}_4$ ) is a highly reactive compound widely used as a rocket propellant.

Draw a dot and cross diagram to show the covalent bonding in a molecule of hydrazine. Only the outer electrons in each atom need to be shown.

[3]

Compound Z is a sweet-smelling liquid often used as a solvent in nail varnish removers.

Compound Z contains 54.5% carbon, 9.1% hydrogen and 36.4% oxygen by mass. Calculate the empirical formula of Z.

[3]

The relative formula mass ( $M_r$ ) of Z is 88. What is the molecular formula of Z?

[3]

Chemical formulae, equations and calculations Questions

Hydrazine ( $N2H4\text{N}_2\text{H}_4$ ) is a highly reactive compound widely used as a rocket propellant.

Draw a dot and cross diagram to show the covalent bonding in a molecule of hydrazine. Only the outer electrons in each atom need to be shown.

[3]

Compound Z is a sweet-smelling liquid often used as a solvent in nail varnish removers.

Compound Z contains 54.5% carbon, 9.1% hydrogen and 36.4% oxygen by mass. Calculate the empirical formula of Z.

[3]

The relative formula mass ( $M_r$ ) of Z is 88. What is the molecular formula of Z?

[3]