During the reaction P4 + 5O 2 P4 O10, 1.5 moles of product was made in 30 seconds. What is the rate of reaction? a) 0.011 g/min
b) 210 g/min
c) 380 g/min
d) 850 g/min

850g/min

Explanation:

The reaction expression is given as:

      P₄  +  5O₂   →   P₄O₁₀

Given that:

Number of moles of product  = 1.5moles

Time  = 30s = 0.5min

Unknown:

The rate of the reaction  = ?

Solution:

Convert the moles given to mass of the product.

     So;

     Mass of product  = number of moles x molar mass

Molar mass of P₄O₁₀   = 4(31) + 10(16)  = 284g/mol

    Mass of product  = 1.5moles x 284g/mol  = 426g

So;

 Reaction rate  =   =   = 850g/min

the answer to this question is 3.

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