In a chemical reaction, the reaction rate R is a function of the concentration x of the product of the reaction. For a certain second-order

In a chemical reaction, the reaction rate R is a function of the concentration x of the product of the reaction. For a certain second-order reaction between two substances, we have the formula below in function notation. R(x) = 0.01 x 2 – x + 19 The concentration x is measured in moles per cubic meter, and R is measured in moles/m 3 · s. (a) Calculate the value of R(18). Express to a maximum of two decimal places. _____moles/m 3 · s (b) Calculate the value of R(21). Express to a maximum of two decimal places. _____moles/m 3 · s (c) The reaction is said to be in equilibrium when the reaction rate equals zero. At what two concentrations is the reaction in equilibrium? Hint: Let R(x) = 0. Express answers to nearest whole units. _____moles/m 3 (smaller value) _____moles/m 3 (larger value)

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