Which pair shares the same empirical formula?
1 answer:
Answer:- 3. and
Explanations:- An empirical formula is the simplest whole number ratio of the moles of atoms present in the compound.
If we simplify the first par formula then they becomes and CH. This pair does not share the same empirical formula.
Second pair formulas are already simple and could not be further simplify. Since they are different, it is also not the right option.
Fourth pair has CH and .
could be simplify to
. The two formulas are still different and so it is not the right choice.
The only correct one is third pair as one of them is and other one is
could be simplify to
. This pair share the same empirical formula,
.
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Rate law for the given 2nd order reaction is:
Rate = k[a]2
Given data:
rate constant k = 0.150 m-1s-1
initial concentration, [a] = 0.250 M
reaction time, t = 5.00 min = 5.00 min * 60 s/s = 300 s
To determine:
Concentration at time t = 300 s i.e.
Calculations:
The second order rate equation is:
substituting for k,t and [a] we get:
1/[a]t = 0.150 M-1s-1 * 300 s + 1/[0.250]M
1/[a]t = 49 M-1
[a]t = 1/49 M-1 = 0.0204 M
Hence the concentration of 'a' after t = 5min is 0.020 M