# One hundred kilograms of molecular hydrogen (H2) is fed into a reactor each hour. What is the molar flow rate of this stream in gram-moles/ hour?

Question

One hundred kilograms of molecular hydrogen (H2) is fed into a reactor each hour. What is the molar flow rate of this stream in gram-moles/ hour?

Step 1

Molar flow rate of a stream is defined as number of moles of substance per unit time entering the reactor.

Mass flow  rate of a stream is defined as mass of the substance per unit time entering the reactor.

Step 2

Mass flow rate of hydrogen (H­2) = 100 kg/h

Molecular mass of hydrogen (H­2) = 2 g/mol

1 g (gram) = 1000 kg (kilogram)

Step 3

Mass flow rate is converted into molar flow rate as follows:

Molar flow rate =  mass flow rate/ molecular mass

Where Ḟ denotes molar flow rate (gram-mol/h)

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