Question

What is the ratio between masses of (a) hydrogen and oxygen in H2O (b) nitrogen and hydrogen

in NH3? [Atomic mass of H = 1 u, O = 16 u, N = 14 u]

What is the ratio between masses of carbon and oxygen in CO2?

[Atomic mass of C = 12 u, O = 16 u]

As per the law of definite proportions carbon and oxygen combine in a ratio of 3 : 8. Compute the

mass of oxygen gas that would be required to react completely with 6 g carbon.

Name the anion and cation which constitute the molecule of magnesium oxide.

An element X has a valency 3. Write the formula of its oxide.

Name the international organisation which approves the name given to the elements.

The oxide of aluminium has a chemical formula Al2O3

. State the valency of Al.

Write the symbol for following elements:

(a) Iron (b) Potassium

Calculate formula unit mass of sugar (C12H22O11

).

Give the difference between a cation and an anion?

Write the names of the following compounds:

(a) Al2

(SO4

)3

(b) NH4OH

Write the chemical formula of the compound zinc hydroxide.

Find the formula unit mass of NaHCO3

:

[Atomic mass of Na = 23 u, H = 1 u, C = 12 u, O = 16 u]

Calculate the formula unit mass of Na2CO3

.

[Atomic mass of Na = 23 u, C = 12 u, O = 16 u]​

Answer 1

Answer:

The ratio between mass of oxygen and hydrogen in H2O is 1:8