Average rate = - d reactant/d time + d product/d time
negative sign indicates that decrease in concentration of reactant and positive sign shows the increment in concentration of product
d represents the change in concentration, t represents time
Considering the reaction
2H3PO4→P2O5+3H2O
rate = d ( p^2o^5)/ d t
= (p^2o^5) 40 sec - (p^2o^5) 10 sec / 30
= 7.0 * 10^-3- 1.10 * 10^-3/30
rate = 2 * 10^-4m/s
2H3PO4→P2O5+3H2O
rate = - d H3PO4/2t = d ( p^2o^5)/ d t
d H3PO4/t = 2 * d ( p^2o^5)/ d t
= 2 * 2 * 10^-4
= 4 * 10^4 m/s
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