How do you determine the number of moles in 78.6 grams of carbon tetrachloride (CCl4) ?
hmm.. i think first you have to add the atomic mass of Carbon + 4 * Cl's atomic mass
C=12.010
4Cl=4*35.45
CCL4=153.81g
Now set up the equation the same way I did in your other post.
oh sorry its CCl4=153.81g
To determine the number of moles in a sample of a substance, you can use the formula:
moles = mass / molar mass
In this case, you are given a mass of 78.6 grams of carbon tetrachloride (CCl4). To find the molar mass of carbon tetrachloride, you need to calculate the sum of the molar masses of its constituent elements: carbon (C) and chlorine (Cl).
- The atomic mass of carbon (C) is approximately 12.01 grams/mole.
- The atomic mass of chlorine (Cl) is approximately 35.45 grams/mole.
Carbon tetrachloride (CCl4) contains one carbon atom and four chlorine atoms, so you need to multiply the atomic mass of carbon by one and the atomic mass of chlorine by four, and then add the results together:
Molar mass of CCl4 = (1 × atomic mass of C) + (4 × atomic mass of Cl)
Molar mass of CCl4 = (1 × 12.01 g/mol) + (4 × 35.45 g/mol)
Now, you can calculate the molar mass of carbon tetrachloride.
Molar mass of CCl4 = 12.01 g/mol + 141.8 g/mol
Molar mass of CCl4 = 153.81 g/mol
Finally, you can substitute the given mass of carbon tetrachloride into the formula to find the number of moles:
moles = 78.6 g / 153.81 g/mol
By dividing the mass by the molar mass, you can determine that there are approximately 0.510 moles of carbon tetrachloride in 78.6 grams.