To determine the amount of heat released upon complete combustion of 1 mol of methane, we simply multiply the heat of combustion of methane with the mass of methane. In this case, first, we need the molar mass of methane to convert the moles of methane given to grams of methane. We then have the following equation:
1 mol CH₄ x 16.0425 g/ mol CH₄ x 50.1 kJ/ g CH₄ = 803.73 kJ
Thus, the heat generated upon complete combustion of 1 mol of CH₄ is 803.73 kJ
Answer:
Explanation:
The relation between frequency and wavelength is shown below as:
c is the speed of light having value
Given, Frequency = 103.4 MHz = ( as 1 MHz = 10⁶ Hz)
Thus, Wavelength is:
Answer:
Explanation:
Physical Change:
The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.
These changes were reversible.
They have same chemical property.
These changes can be observed with naked eye.
Example
:
Water converting to Ice
Water converting to gas
In this water molecule remain the same only they rearrange themselves that change its state of mater not composition
Chemical changes:
The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.
These changes are irreversible
These changes occur due to chemical reactions
These may not be observed with naked eye
Example:
Combustion of fuel or wood: that oil or wood convert into energy, CO₂ and ash in case of wood
Boiling of egg: that change the chemical composition of protein in the egg
The reaction of Hydrogen and oxygen:
H₂ (g) + O₂ (g) -------------------------------------> 2H₂O (l)
The Kj of heat that are needed to completely vaporize 1.30 moles of H2O if the heat of vaporization for water is 40.6 Kj/mole is calculated as below
Q(heat) = moles x heat of vaporization)
=1.30 mol x40.6 kj/mol= 52.78 Kj is needed
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