Answer:-
![2A+3B\rightarrow 5C](https://img.qammunity.org/2020/formulas/chemistry/high-school/8k7yhit9t9pk1pam12s36bs6m7dkl6ctin.png)
Explanations:- Let's say the first molecule is A and the second molecule is B and the product molecule is C.
From given information, 2 molecules of A react with 3 molecules of B to produce 5 molecules of C.
We write the reactants on left side and the product on right side and there is an arrow between them from reactants towards the products.
So, the reaction could be represented as:
![2A+3B\rightarrow 5C](https://img.qammunity.org/2020/formulas/chemistry/high-school/8k7yhit9t9pk1pam12s36bs6m7dkl6ctin.png)