Complete the bolded items in each box below
1 answer:
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Answer:
<u>= 48.077 kcal </u>
Explanation:
The balanced equation is :
Since the stoichiometric coefficient of Na2O = 1 hence its heat is
<u>-120 Kcal/mol</u> rather -120 Kcal only.
This means when 1 mole of the Na2O is burned , then 120 kcal of energy is released .
Molar mass of Na2O = 2(mass of Na) + 1(mass of O)
= 2(22.98)+16
=61.97 gram/mol
Molar mass = mass of the substance in grams present in 1 mole of it.
In 1 mole of Na2O , 61.97 gram of it is present.
Hence
61.97 gram of Na2O = -120 Kcal of heat is released
1 gram of Na2O =
So,
24.8 gram of Na2O will produce,
= -48.077 kcal of heat
You can also proceed through mole concept:
Calculate number of moles in 24.8 gram Na2O
Moles of Na2O = 24.08/61.9 = 0.4007 moles
So these many moles will produces:
0.4007 x 120
=-48.07