BRAINLIEST FOR CORRECT ANSWER
In a reaction the 48cm3 of gas is produced in 97 seconds. Remember to check worked example 2 and calculate the rate of reaction.

In a reaction the mass of a reactant changes from 43g at the start to 22g at the end. This takes 79 seconds. What is the rate? (hint – you can use the two masses to work out the mass of reactant lost)