Question

Ex: Mg + 2HCl—-> MgCl₂ + H₂ If 4.48L of H₂ gas at STP is

produced in 40 sec, what is the reaction rate in mol/sec?

Answer 1

The reaction rate in mol/sec is 0.005.

Step-by-step explanation:

To determine the reaction rate in mol/sec, you need to first determine the number of moles of H₂ gas produced in the reaction. The volume of a gas at STP (standard temperature and pressure) is directly proportional to the number of moles of the gas, so you can use the volume of H₂ gas produced to calculate the number of moles.

At STP, 1 mole of a gas occupies a volume of 22.4 L. Therefore, the number of moles of H₂ gas produced in the reaction can be calculated as follows:

moles H₂ = 4.48 L / 22.4 L/mol = 0.2 mol

To determine the reaction rate in mol/sec, you need to divide the number of moles of H₂ gas produced by the time it took for the reaction to occur:

reaction rate (mol/sec) = 0.2 mol / 40 sec = 0.005 mol/sec

So, the reaction rate in mol/sec is 0.005.