Question

How many moles are in 89 grams of KCI

Answer 1

Answer:

The number of moles in 89 grams of KCl is approximately 1.193 moles

Explanation:

A mole of an element or compound, is the quantity of the element or compound that contains 6.022 × 10²³ molecules of the element or compound, such that the molar mass of one mole is dependent on the mass of each molecule of the element or compound that make up the 6.022 × 10²³ particles

The given parameters are;

The mass of the KCl = 89 grams

The Molar mass, MW, of potassium, K = 39.1 g/mole

The Molar mass, MW, of chlorine, Cl = 35.5 g/mole

Therefore, given that KCl, has one K and one Cl, per mole, we have;

The Molar mass, MW, of potassium chloride, KCl = (39.1 + 35.5) g/mole = 74.6 g/mole

$The \ number \ of \ moles, n=\dfrac{Mass}{Molar \ mass, MW}$

Therefore, the number of moles of KCl in 89 g, 'n' is given as follows;

n = (89 g)/(74.6 g/mole) ≈ 1.193 moles

The number of moles in 89 grams of KCl, n ≈ 1.193 moles.

Answer 2

Given:

mass of KCl = 89 g

MW K = 39.1 g/mol

MW Cl = 35.5 g/mol

Required:

moles of KCl

Solution:

Step 1: Calculate the MW of KCl.

MW KCl = MW K + MW Cl

MW KCl = 39.1 g/mol + 35.5 g/mol

MW KCl = 74.6 g/mol

Step 2: Solve for the number of moles of KCl.

$\text{moles of KCl} = \dfrac{\text{mass of KCl}}{\text{MW KCl}}$

$\text{moles of KCl} = \dfrac{\text{89 g}}{\text{74.6 g/mol}}$

$\boxed{\text{moles of KCl = 1.2 mol}}$

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