Caslcualte the formula massfor each of the following compunds
CS2
C6H12O6
Fe(nO3)3
C7H16
Look up the mass for each of these elements on a periodic table.
Mass of Carbon + two times the mass of sulfur.
6 times the mass of Carbon + 12 times the mass of Hydrogen + 6 times the mass of oxygen.
To calculate the formula mass for each compound, you need to determine the molar mass of each element and then add them up based on their respective ratios.
1. CS2:
- The molar mass of carbon (C) is approximately 12.01 g/mol.
- The molar mass of sulfur (S) is approximately 32.07 g/mol.
To calculate the formula mass of CS2:
Formula mass = (Molar mass of carbon x number of carbon atoms) + (Molar mass of sulfur x number of sulfur atoms)
= (12.01 g/mol x 1) + (32.07 g/mol x 2)
= 12.01 g/mol + 64.14 g/mol
= 76.15 g/mol
2. C6H12O6:
- The molar mass of carbon (C) is approximately 12.01 g/mol.
- The molar mass of hydrogen (H) is approximately 1.01 g/mol.
- The molar mass of oxygen (O) is approximately 16.00 g/mol.
To calculate the formula mass of C6H12O6:
Formula mass = (Molar mass of carbon x number of carbon atoms) + (Molar mass of hydrogen x number of hydrogen atoms) + (Molar mass of oxygen x number of oxygen atoms)
= (12.01 g/mol x 6) + (1.01 g/mol x 12) + (16.00 g/mol x 6)
= 72.06 g/mol + 12.12 g/mol + 96.00 g/mol
= 180.18 g/mol
3. Fe(NO3)3:
- The molar mass of iron (Fe) is approximately 55.85 g/mol.
- The molar mass of nitrogen (N) is approximately 14.01 g/mol.
- The molar mass of oxygen (O) is approximately 16.00 g/mol.
To calculate the formula mass of Fe(NO3)3:
Formula mass = (Molar mass of iron x number of iron atoms) + (Molar mass of nitrogen x number of nitrogen atoms) + (Molar mass of oxygen x number of oxygen atoms)
= (55.85 g/mol x 1) + (14.01 g/mol x 3) + (16.00 g/mol x 9)
= 55.85 g/mol + 42.03 g/mol + 144.00 g/mol
= 241.88 g/mol
4. C7H16:
- The molar mass of carbon (C) is approximately 12.01 g/mol.
- The molar mass of hydrogen (H) is approximately 1.01 g/mol.
To calculate the formula mass of C7H16:
Formula mass = (Molar mass of carbon x number of carbon atoms) + (Molar mass of hydrogen x number of hydrogen atoms)
= (12.01 g/mol x 7) + (1.01 g/mol x 16)
= 84.07 g/mol + 16.16 g/mol
= 100.23 g/mol
Therefore, the formula masses for the given compounds are:
- CS2: 76.15 g/mol
- C6H12O6: 180.18 g/mol
- Fe(NO3)3: 241.88 g/mol
- C7H16: 100.23 g/mol