Can anyone help me with this question? The answer is C

Solutions of two compounds, W and X, react together in the presence of a soluble catalyst, Y, as shown in the equation

2W + X → Z

When the concentrations of W, X and Y are all doubled, the rate of reaction increases by a

factor of four.

Which is a possible rate equation for this reaction?

A rate = k [W]^2[X]

B rate = k [W]^2[Y]

C rate = k [X] [Y]

D rate = k [X] [Z]

Solutions of two compounds, W and X, react together in the presence of a soluble catalyst, Y, as shown in the equation

2W + X → Z

When the concentrations of W, X and Y are all doubled, the rate of reaction increases by a

factor of four.

Which is a possible rate equation for this reaction?

A rate = k [W]^2[X]

B rate = k [W]^2[Y]

C rate = k [X] [Y]

D rate = k [X] [Z]

Can't be A because since W is order 2 and X is order 1 there, and [X] and [W] double, the rate of reaction would multiply by 2^2 * 2 = 8, rather than 4.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

Original post by MedicPls

Can't be A because since W is order 2 and X is order 1 there, and [X] and [W] double, the rate of reaction would multiply by 2^2 * 2 = 8, rather than 4.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

thank so much , extremely useful even 3 years later

Original post by MedicPls

Can't be A because since W is order 2 and X is order 1 there, and [X] and [W] double, the rate of reaction would multiply by 2^2 * 2 = 8, rather than 4.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

Same goes for B, just think about it with Y instead of X.

C is correct, because doubling 2 order 1 reactants will each have the effect of doubling the rate - so since 2 things double the rate, the rate multiplies by 2*2 = 4.

D is wrong because Z isn't a reactant so can't be in the rate equation.

as the person above me said, thanks so much!

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