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[tex]O_{3}[/tex] = 45.3 grams
volume = 0.225 litre
molarity =?
atomic mass of KNO3 = 101 grams/mole
molarity is calculated by using the formula:
molarity = [tex]\frac{number of moles}{volume of the solution}[/tex]
first the number of moles present in the given mass is calculated as:
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
number of moles = [tex]\frac{45.3}{101}[/tex]
0.44 moles of KNO3
Putting the values in the equation of molarity:
molarity = [tex]\frac{0.44}{0.225}[/tex]
molarity = 1.95
It can be taken as 2.
The molarity of the potassium nitrate solution is 2.
