For a given sample of CH3OH, the enthalpy change on reaction is 17.0 kj. How many grams of hydrogen gas are produced?
Do you have an equation for the reaction? There is little to go on to write one.
To determine the amount of hydrogen gas produced, we need to use the balanced chemical equation for the reaction of CH3OH.
The balanced equation is:
CH3OH + H2O -> CO2 + 3H2
From the equation, we can see that one mole of CH3OH produces three moles of H2.
To calculate the number of moles of CH3OH, we need to use the molar mass of CH3OH, which is approximately 32 g/mol.
So, first, we need to convert the given enthalpy change from kilojoules to joules:
17.0 kJ * 1000 J/kJ = 17000 J
Now, we can use the molar enthalpy change (ΔH) to calculate the moles of CH3OH:
17000 J / ΔH = moles of CH3OH
Since the balanced equation shows that one mole of CH3OH produces three moles of H2, we can then multiply the moles of CH3OH by 3 to get the moles of H2:
moles of CH3OH * 3 = moles of H2
Finally, we can convert the moles of H2 to grams using the molar mass of hydrogen, which is approximately 2 g/mol:
moles of H2 * molar mass of H2 = grams of H2
By following these steps, you can find the mass of hydrogen gas produced from a given sample of CH3OH.