Chromium-51 is a radioactive isotope used to label red blood cells to identify if they remain intact in the body. It has a half-
2 answers:
Answer:
Amount of chromium-51 remaining after 83.1 days = 0.031 mg
Explanation:
Radioactive disintegration follows the exponential law which can be mathematically expressed as:
where N(0) = initial amount of the radioactive substance
N(t): radioactive substance left after time t
t1/2 = half life of the radioisotope
In the case of chromium-51:
N(0) = 0.25 mg
t = 83.1 days
t1/2 = 27.7 days
Substituting these values in equation (1) gives:
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Answer : The partial pressure of and
is, 216.5 mmHg and 649.5 mmHg
Explanation :
According to the Dalton's Law, the partial pressure exerted by component 'i' in a gas mixture is equal to the product of the mole fraction of the component and the total pressure.
Formula used :
So,
where,
= partial pressure of gas
= mole fraction of gas
= total pressure of gas
= moles of gas
= total moles of gas
The balanced decomposition of ammonia reaction will be:
Now we have to determine the partial pressure of and
Given:
and,
Given:
Thus, the partial pressure of and
is, 216.5 mmHg and 649.5 mmHg
and
.
Assuming complete decomposition of both samples,
First compound:
;
of the first compound would contain
Oxygen and mercury atoms seemingly exist in the first compound at a ratio; thus the empirical formula for this compound would be
where the subscript "1" is omitted.
Similarly, for the second compound
;
of the first compound would contain
and therefore the empirical formula
.