Mercury(II) Oxide decomposes upon heating, producing elemental
mercury.
This reaction has an enthalpy value of 90.8 kJ/mol.
How much heat is required to produce 2000 lbs of mercury?
2000 lbs Hg x (453.6 g/lb) = ? grams Hg = approx 9.07E5
2HgO ==> 2Hg + O2 + 90.8 kJ/mol
90.8 kJ/mol x (9.07E5/2*molar mass HgO) = ?
To determine the amount of heat required to produce 2000 lbs of mercury, we need to follow these steps:
Step 1: Convert pounds to grams
First, we need to convert pounds to grams, as the enthalpy value is given in kJ/mol. The conversion factor is:
1 lb = 453.59237 grams
So, 2000 lbs will be equal to:
2000 lbs * 453.59237 g/lb = 907,184.74 grams
Step 2: Convert grams to moles
Next, we need to convert grams of mercury to moles. To do this, we need to know the molar mass of mercury, which is 200.59 g/mol.
The number of moles of mercury can be calculated as follows:
moles = grams / molar mass
moles = 907,184.74 g / 200.59 g/mol ≈ 4525.24 moles
Step 3: Calculate the heat required
Now that we have the number of moles of mercury, we can calculate the heat required using the enthalpy value given.
Heat required = moles * enthalpy value
Heat required = 4525.24 moles * 90.8 kJ/mol
Finally, we can calculate the heat required to produce 2000 lbs of mercury:
Heat required = 411,265.52 kJ