Respuesta :
Answer: 8.2 grams of potassium dichromate the chemist has been added to the flask.
Explanation:
Molarity is defined as the number of moles of solute dissolved per liter of the solution.
To calculate the number of moles for given molarity, we use the equation:
[tex]\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}[/tex] .....(1)
Molarity of potassium dichromate solution = 0.11 M
Volume of solution = 0.25 L
Putting values in equation 1, we get:
[tex]0.11M=\frac{\text{Moles of potassium dichromate}}{0.25L}\\\\{\text{Moles of potassium dichromate}}={0.11mol/L\times 0.25L}=0.028mol[/tex]
Mass of potassium dichromate =[tex]moles\times {\text {molar mass}}=0.028mol\times 294g/mol=8.2g[/tex]
Thus mass in grams of potassium dichromate the chemist has added to the flask is 8.2.
Answer:
The mass of potassium dichromate is 8.1 grams
Explanation:
Step 1: Data given
Volume of potassium dichromate solution = 0.25L
Molarity = 0.11M
Molar mass of potassium dichromate = 294.185 g/mol
Step 2: Calculate moles K2Cr2O7
Moles K2Cr2O7 = molarity * volume
Moles K2Cr2O7 = 0.11M * 0.25L
Moles K2Cr2O7 = 0.0275 moles
Step 3: Calculate mass K2Cr2O7
Mass K2Cr2O7 = moles K2Cr2O7 * molar mass K2Cr2O7
Mass K2Cr2O7 = 0.0275 moles * 294.185 g/mol
Mass K2Cr2O7 = 8.1 grams
The mass of potassium dichromate is 8.1 grams
