If the molecular mass for a chemical is 151.97 g/mol and the enthalpy of formation is -1128 kJ/mol, the heat change will be
_______kJ when 10.0 g of this chemical is formed.
-1128 kJ x (10g/151.97) =
Thank you!
To calculate the heat change when 10.0 g of the chemical is formed, we need to use the given enthalpy of formation and the molecular mass.
Here's how to get the answer step-by-step:
1. Calculate the number of moles of the chemical in 10.0 g:
Number of moles = Mass / Molecular mass
In this case, the molecular mass is given as 151.97 g/mol. So,
Number of moles = 10.0 g / 151.97 g/mol
2. Calculate the heat change for one mole of the chemical using enthalpy of formation:
Heat change = Number of moles × Enthalpy of formation
In this case, the enthalpy of formation is given as -1128 kJ/mol. So,
Heat change = (Number of moles from step 1) × (-1128 kJ/mol)
3. Calculate the heat change when 10.0 g of the chemical is formed:
Heat change = (Heat change from step 2) × 10.0
Now, you can substitute the values into the formulas to get the answer.