The mass of metal that burns to produce an enthalpy change of -9.00*10^4 kJ
To determine the mass of metal that burns to produce an enthalpy change of -9.00 * 10^4 kJ, we need to know the specific enthalpy change of combustion for the metal. This value represents the amount of energy released per unit mass when the metal undergoes combustion.
If you provide the specific enthalpy change of combustion for the metal in question, I can help you calculate the mass.
To calculate the mass of metal that burns to produce an enthalpy change of -9.00 * 10^4 kJ, we need to know the specific enthalpy change (ΔH) of combustion for the metal.
The equation for calculating the mass of metal is:
Mass = ΔH / ΔH of combustion
Assuming the specific enthalpy change of combustion is known, let's say it's -400 kJ/g (this value will vary depending on the metal), we can now calculate the mass of metal as follows:
Mass = (-9.00 * 10^4 kJ) / (-400 kJ/g)
Dividing -9.00 * 10^4 kJ by -400 kJ/g, we can cancel out the kJ units:
Mass = (9.00 * 10^4) / 400 g
Mass = 225 g
Therefore, the mass of metal that burns to produce an enthalpy change of -9.00 * 10^4 kJ is 225 grams.
To determine the mass of metal that burns to produce a specific enthalpy change, you need to know some additional information, such as the enthalpy change per mole of metal and the molar mass of the metal.
1. Enthalpy Change per Mole of Metal (ΔH):
The enthalpy change provided, -9.00 * 10^4 kJ, typically refers to the enthalpy change for the combustion of one mole of metal.
2. Molar Mass of the Metal (M):
The molar mass of the metal is required to convert the enthalpy change from per mole to per gram or kilogram.
Once you have gathered this information, you can use the following steps to calculate the mass of metal:
Step 1: Convert kJ to J
Since the molar mass is usually given in grams and the enthalpy change is typically given in J, convert kJ to J by multiplying by 1000:
-9.00 * 10^4 kJ * 1000 J/kJ = -9.00 * 10^7 J
Step 2: Calculate Moles of Metal
Use the molar mass to determine the number of moles of metal:
moles = enthalpy change (J) / enthalpy change per mole (J/mol)
Step 3: Convert Moles to Grams or Kilograms
Based on the desired unit, use the molar mass of the metal to convert moles to grams or kilograms:
mass (grams) = moles * molar mass (grams/mol)
mass (kilograms) = mass (grams) / 1000
By following these steps, you can calculate the mass of the metal that burns to produce the given enthalpy change.