The Whytboard Molar Mass, Moles, Mass

Good luck on your Whytboard quiz about molar , mass, moles, and mass! You've got the fundamentals down! Stay calm, trust your calculations, and convert with confidence; small steps like mass over molar mass will lead you to the right answers. Crush it ! You're ready to mole the competition!

• LET'S GO !

• PADAYON !

Using the given provided Cu = 63.55 g/mol

• S = 32.07 g/mol

• O = 16.00 g/mol, Calculate the molar mass of CuSO₄

• 234 g/mol

• 159.5 g/mol

• 146.5 g/mol

• 156 g/mol

Answer explanation

• (Like the illustration given, simply add)

• Copper (Cu) atomic mass = 63.55 g/mol

• Sulfur (S) atomic mass = 32.07 g/mol

• Oxygen (O) atomic mass = 16.00 g/mol, and there are 4 oxygens, so 16.00×4=64.0016.00×4=64.00 g/mol

Add these together to get the molar mass:
63.55 + 32.07 + 64.00 = 159.62 g/mol

For 10 g of CuSO₄, calculate its moles

• 0.067 mol.

• 0.68 mol.

• 0.063 mol.

• 0.066 mol.

Answer explanation

• To calculate the number of moles (n) of CuSO₄, use the formula n=m/M, where mm is the mass in grams and MM is the molar mass (159.61 g/mol).

For 10 g of CuSO₄,

n= 10/159.6110

n = 0.063 mol.

Using the identified moles, calculate the mass of CuSO₄

• 100.55grams

• 100.5grams

• 102.55grams

• 101.55grams

Answer explanation

• To calculate the mass of CuSO4 for 0.63 moles, use the formula:

• m = n x Mr

• m = 0.63moles × 1 59.6g/mol

• m = 100.55 g

Calculate the molar mass of Cr₄(P₂O₇)₃ using the given g/mol below
Cr = 51.996 g/mol

P = 30.974 g/mol

O = 15.999 g/mol

• 745.81 g/mol

• 748.56 g/mol

• 729.81 g/mol

• 734.61 g/mol

Answer explanation

(Like the illustration given, simply add)

Chromium (Cr): 4 atoms × 51.996 g/mol = 207.98 g/mol

• Phosphorus (P): 6 atoms (2 per P₂O₇ × 3) × 30.974 g/mol = 185.84 g/mol

• Oxygen (O): 21 atoms (7 per P₂O₇ × 3) × 15.999 g/mol = 335.98 g/mol

• Total: 207.98 + 185.84 + 335.98 = 729.81 g/mol.

The number of moles of Cr₄(P₂O₇)₃ in 10 g is _____

• 0.016 mol.

• 0.015 mol.

• 0.017 mol.

• 0.014 mol.

Answer explanation

• To calculate the number of moles (n) of Cr₄(P₂O₇)₃, use the formula n=m/M, where mm is the mass in grams (10g) and MM is the molar mass 729.81 g/mol

For 10 g of CuSO₄,

n= 10/729.81 g/mol

n = 0.014mol

Using the identified moles, calculate the mass of Cr₄(P₂O₇)₃

• 9.24 g

• 10.22 g

• 12.54 g

• 7. 7.56 g

Answer explanation

• To calculate the mass from the identified moles of Cr₄(P₂O₇)₃:

• • Given moles = 0.014 mol

  • Molar mass MM = 729.81 g/mol

  Use the formula:

  Mass = Moles × Molar mass

Solution:

• Mass = 0.014×729.81 =10.22 grams

• Mass = 10.22grams

Great job wrapping up your Whytboard quiz on molar mass, moles, and mass! Your hard work mastering those conversions from grams to particles has clearly paid of, proud of how you tackled the calculations. Celebrate this step in your chemistry journey, you're nailing the fundamentals!

• • I feel confident with my quiz results!

• • I found some parts challenging but learned a lot.

• • I need more practice with molar mass and moles.

• • The quiz helped me understand concepts better.

• • I’m proud of my progress so far.