Question

Calculate the molarity of 1.60 L of a solution containing 8.53 g of dissolved KBr.

HINT: Calculate the molar mass of KBr before calculating the molarity. HELPPPP

Answer 1

0.044 M is the molarity of 1.60 L of a solution containing 8.53 g of dissolved KBr.

Step-by-step explanation:

Data given:

volume of the solution = 1.60 litres

mass of KBr = 8.53 grams

atomic mass of KBr = 119.002 gram/moles (K = 39.09 g/mole + 79.9 g/mole)

number of moles =?

molarity of KBr solution =?

First the number of moles will be calculated by using the formula:

number of moles =
`(mass)/(atomic mass of 1 mole)`

putting the values in the equation:

number of moles =
`(8.53)/(119.002)`

number of moles = 0.071 moles of KBr

now molarity is calculated using the formula:

molarity =
`(number of moles)/(volume in litres)`

putting the values in the equation:

molarity =
`(0.071)/(1.6)`

= 0.044 M

molarity of KBr solution is 0.044 M