Question

Write the formulae for the following and calculate the molecular mass for each one of them.
(A) Caustic potash
(B) Baking powder
(C) Limestone
(D) Caustic soda
(E) Ethanol
(F) Common salt

Accepted Answer

(A)The chemical formula of caustic potash is $KOH$ .

The molecular mass of $KOH$ = The molar mass of $K$ + the molar mass of $O$ + molar mass of $H$
$= 39 + 16 + 1 = 56 g / mol .$

(B) The chemical formula of baking powder is ${NaHCO}_{3}$ .

The molecular mass of baking powder $({NaHCO}_{3})$ $= 23 + 1 + 12 + 3 \times 16 = 84 g / mol .$

(C) The chemical formula of Lime stone is ${CaCO}_{3}$ $= 40 + 12 + 3 \times 16 = 100 g / mol .$

(D) The chemical formula of Caustic soda is $NaOH$ .

The molecular mass of Caustic soda $(NaOH)$ $= 23 + 16 + 1 = 40 g / mol .$

(E) The chemical formula of Ethanol is $C_{2} H_{5} OH$ .

The molecular mass of Ethanol $(C_{2} H_{5} OH)$ .

$= 2 \times 12 + 5 \times 1 + 16 + 1 = 46 g / mol .$

(F) The chemical formula of Common salt is $NaCl$ .
The molecular mass of Common salt $(NaCl)$ $= 23 + 35.5 = 58.5 g / mol .$

Write the formulae for the following and calculate the molecular mass for each one of them.
(A) Caustic potash
(B) Baking powder
(C) Limestone
(D) Caustic soda
(E) Ethanol
(F) Common salt

Important Questions on Sample Paper

Learn and Prepare for any exam you want !

Write the formulae for the following and calculate the molecular mass for each one of them. (A) Caustic potash (B) Baking powder (C) Limestone (D) Caustic soda (E) Ethanol (F) Common salt

Important Questions on Sample Paper

Learn and Prepare for any exam you want !

Write the formulae for the following and calculate the molecular mass for each one of them.
(A) Caustic potash
(B) Baking powder
(C) Limestone
(D) Caustic soda
(E) Ethanol
(F) Common salt