using mass or conc in rate laws

[Summer de Vera 2C]

Hi! Just to confirm, can you either use mass (g) or concentration (M) in the rate laws if it's a sealed vessel? If so, does someone mind explaining this further?

[Tuong-Minh Tran 1C]

Rate laws typically only use concentration. If a question gives or asks for the mass of a product or reactant, then you'll have to use the molar mass and volume of the substances involved to convert between mass and concentration.

[Yiting_Gong_4L]

when working with rate laws, you should be using concentration.
given grams of a substance and volume you can solve for the M which is concentration to plug into rate laws.