Methanol + Butanoic acid + Sulfuric acid = Pinapple

Methanol + Salicylic acid + Sulfuric acid = wintergreen

Ethanol + Methanoic acid + Sulfuric acid = rum

How to write the chemical formulae for each?

All of them are similar. If we let RCOOH stand for the acid (you supply the R as appropriate for each acid) and R'OH stand for the alcohol (either methanol or ethanol), then the ester produced will be RCOOR' and the other product will be H2O..

To write the chemical formulae for each reaction, you need to understand the chemical structures of the reactants and products. Let's break down each reaction and write the chemical formulae step by step:

Reaction 1:
Methanol + Butanoic acid + Sulfuric acid = Pineapple

Step 1: Identify the chemical structures of the reactants:
- Methanol: CH3OH
- Butanoic acid: CH3CH2CH2COOH
- Sulfuric acid: H2SO4

Step 2: Write the chemical formulae for the reaction by combining the reactants:
- CH3OH + CH3CH2CH2COOH + H2SO4 = Pineapple

Since the chemical formula for "pineapple" is not provided, it is not possible to write an accurate chemical formula for the product.

Reaction 2:
Methanol + Salicylic acid + Sulfuric acid = Wintergreen

Step 1: Identify the chemical structures of the reactants:
- Methanol: CH3OH
- Salicylic acid: C6H4(OH)COOH
- Sulfuric acid: H2SO4

Step 2: Write the chemical formulae for the reaction by combining the reactants:
- CH3OH + C6H4(OH)COOH + H2SO4 = Wintergreen

Since "wintergreen" is a common name and can refer to either methyl salicylate (C8H8O3) or another compound with a wintergreen scent like menthol, the actual chemical formula for the product is not clear without additional information.

Reaction 3:
Ethanol + Methanoic acid + Sulfuric acid = Rum

Step 1: Identify the chemical structures of the reactants:
- Ethanol: CH3CH2OH
- Methanoic acid: HCOOH
- Sulfuric acid: H2SO4

Step 2: Write the chemical formulae for the reaction by combining the reactants:
- CH3CH2OH + HCOOH + H2SO4 = Rum

As "rum" is a complex product, it is not possible to write an accurate chemical formula as it can vary significantly depending on its composition.

In summary, without further clarification or specific information about the products "pineapple," "wintergreen," and "rum," it is not possible to provide precise chemical formulae for these reactions.