For the reaction:
2 C2H6 (g) + 7 O2 (g) → 4 CO2 (g) + 6 H2O (g) ΔH = - 2044 k2
What can be said about the amount of energy required to break the bonds in the reactants, vs. the amount of energy released when new bonds form in the products?
a.
The amount of energy released when new bonds form in the products is equal to the amount of energy required to break bonds in the reactants.
b.
The amount of energy released when new bonds form in the products is less than the amount of energy required to break bonds in the reactants.
c.
The amount of energy released when new bonds form in the products is greater than the amount of energy required to break bonds in the reactants.
d.
No energy is required to break the bonds in the reactants
Answers
Answer:
How do you find the number of integral solutions of the equation 2x + 3y = 763?
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8 Answers
Manish Dodrajka, Digital Marketeer
Answered Apr 25, 2014
2x + 3y = 763
=> y = (763 - 2x)/3
It has infinite integral solutions as there are infinite integral values of 'x' for which 'y' is an integer.
But the equation has finite number of positive integral solutions and I have solved for it.
Now, for 'y' to be an integer, (763-2x) must be a multiple of 3.
A little observation tells us that it happens when
763-2x=759,753,747,741,735,729......15,9 and 3.
=> x=2,5,8,11,14,17.........371,374,377,380
For each value of 'x', y can be calculated.
The values of 'x' forms an A.P.
so,
380 = 2 + (n-1)3
=>n=127.
Hence, there are 127 solutions to the ...
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