Answer:
Explanation:
The half life of a radioactive atom is the time taken for half of the radioactive nuclei to disintegrate. The shorter the half life, the faster a radioactive nuclei decays.
Half life is often expressed as:
Half life =
Where λ is the decay constant.
<u>Answer:</u> The correct answer is Option c.
<u>Explanation:</u>
We are given:
Mass percentage of = 20 %
So, mole fraction of = 0.2
Mass percentage of = 30 %
So, mole fraction of = 0.3
Mass percentage of = 35 %
So, mole fraction of = 0.35
Mass percentage of = 15 %
So, mole fraction of = 0.15
We know that:
Molar mass of = 16 g/mol
Molar mass of = 28 g/mol
Molar mass of = 26 g/mol
Molar mass of = 48 g/mol
To calculate the average molecular mass of the mixture, we use the equation:
where,
= mole fractions of i-th species
= molar masses of i-th species
= number of observations
Putting values in above equation:
Hence, the correct answer is Option c.