Write the formulae for the following and calculate the molecular mass for each oneof them(a)caustic potash (b) Baking powder (c)limestone (d)Ethanol (e) Common

1. Break Down the Problem

We need to identify the chemical formulas for the given compounds and then calculate their molecular masses.

2. Relevant Concepts

The molecular mass of a compound is calculated by summing the atomic masses of all the atoms in its molecular formula. The atomic masses (in g/mol) for common elements are approximately:

• Potassium (K): 39.10
• Sodium (Na): 22.99
• Carbon (C): 12.01
• Oxygen (O): 16.00
• Hydrogen (H): 1.01
• Calcium (Ca): 40.08

3. Analysis and Detail

a. Caustic Potash (Potassium Hydroxide) - KOH

• Formula: KOH
• Calculation: $\text{Molecular mass} = K + O + H = 39.10 + 16.00 + 1.01 = 56.11 \, \text{g/mol}$

b. Baking Powder (often Sodium Bicarbonate) - NaHCO₃

• Formula: NaHCO₃
• Calculation: $\text{Molecular mass} = Na + H + C + 3O = 22.99 + 1.01 + 12.01 + (3 \times 16.00) = 84.01 \, \text{g/mol}$

c. Limestone (Calcium Carbonate) - CaCO₃

• Formula: CaCO₃
• Calculation: $\text{Molecular mass} = Ca + C + 3O = 40.08 + 12.01 + (3 \times 16.00) = 100.09 \, \text{g/mol}$

d. Ethanol - C₂H₅OH

• Formula: C₂H₅OH
• Calculation: $\text{Molecular mass} = 2C + 6H + O = (2 \times 12.01) + (6 \times 1.01) + 16.00 = 46.08 \, \text{g/mol}$

e. Common Salt (Sodium Chloride) - NaCl

• Formula: NaCl
• Calculation: $\text{Molecular mass} = Na + Cl = 22.99 + 35.45 = 58.44 \, \text{g/mol}$

4. Verify and Summarize

We have calculated the molecular masses for all compounds, ensuring that each component's atomic mass was accurately summed.

Final Answer

1. Caustic Potash (KOH) - 56.11 g/mol
2. Baking Powder (NaHCO₃) - 84.01 g/mol
3. Limestone (CaCO₃) - 100.09 g/mol
4. Ethanol (C₂H₅OH) - 46.08 g/mol
5. Common Salt (NaCl) - 58.44 g/mol