Determine which elements or compounds are products in the follow reaction equation:
1 answer:
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1.95 or 2 is the molarity of a 45.3g sample of KNO3 (101g) dissolved in enough water to make a 0.225L solution.
The correct answer is option b
Explanation:
Data given:
mass of KN = 45.3 grams
volume = 0.225 litre
molarity =?
atomic mass of KNO3 = 101 grams/mole
molarity is calculated by using the formula:
molarity =
first the number of moles present in the given mass is calculated as:
number of moles =
number of moles =
0.44 moles of KNO3
Putting the values in the equation of molarity:
molarity =
molarity = 1.95
It can be taken as 2.
The molarity of the potassium nitrate solution is 2.
Answer:
Two Half-lives
Explanation:
Let number of Parent nuclei Initially present be X,
Then, finally Parent nuclei Will remain with
daughter nuclei.
In one half- life , parent nuclei becomes half of initial.
So, starting with X parent nuclei,
After one half-life, it will degrade to .
After another half life , Parent nuclei will become half of
Which is equal to .
So, Parent nuclei have to go through Two half-lives.