Question
Determine the number of moles of KNO_(3) that are in 784 g of the compound.
Answer
4.4
(203 Votes)
Lowri
Elite · Tutor for 8 years
Answer
The number of moles = 784 g / 101.11 g/mol = 7.75 mol
Explanation
## Step 1:To find the number of moles of a compound, we use the formula:### **Moles = Mass (g) / Molar Mass (g/mol)**## Step 2:The molar mass of a compound is the sum of the molar masses of its constituent elements. The molar mass of KNO3 (Potassium nitrate) can be calculated as follows:Potassium (K): 1 atom × 39.1 g/mol = 39.1 gNitrogen (N): 1 atom × 14.01 g/mol = 14.01 gOxygen (O): 3 atoms × 16.00 g/mol = 48.0 gAdding these up gives the total molar mass of KNO3 as 101.11 g/mol.## Step 3:To find the number of moles, we use the given mass of the compound (784 g) and divide by the molar mass of the compound (101.11 g/mol).