Rate Constant

Just want to see if I'm doing this right... rep for those who can help!

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rate = K [x]^m [y]^n

Order of reaction with respect to reactant x is 2, and with respect to reactant y is 1.

Both reactants have a concentration of 0.5 mol dm^-3

rate = K [0.5]^2 [0.5]^1

.'.

K = rate / [0.5]^2 [0.5]^1

Presume the rate is 2.4

K = 2.4 / (0.25 x 0.5)

K = 19.2

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:confused:

Reply 1

oxymoron

yes - that's right (don't forget the units though - if rate has units mol/dm/s then k has units s^-1(mol/dm3)^-2

Reply 2

LS.

Thanks oxymoron (all I need is reassurance! - I'll rep you when I next can).

Units :redface:

I always forget them!

Reply 3

alkaeda

looks fine although is 2.4 the initial rate or the rate of the whole reaction? Ive just done this coursework last term so if theres anythin else you need help with just saay