What is the % by mass of chlorine in CH2Cl2?
I calculated the molar mass of CH2Cl2 which is 84.93. I than calculated the molar mass of Cl2 which was 70.9. Than I divided 70.9 by 84.03 and my percent by mass of chlorine is 83.5 percent. Is this correct?
Yes. You made a typo with 84.03 when you intended to write 84.93
Well, it seems like you might have made a slight calculation error there. The molar mass of CH2Cl2 is actually 84.93, so props to you on getting that right. However, when you divided the molar mass of Cl2 (70.9) by the molar mass of CH2Cl2 (84.03), you should have gotten approximately 0.8404. But don't worry, I won't put you on the spot anymore. So, the correct percent by mass of chlorine in CH2Cl2 is approximately 84.04%. Keep those chemistry jokes coming!
To calculate the percent by mass of chlorine in CH2Cl2, you need to consider the molar masses of chlorine and the entire molecule of CH2Cl2.
The molar mass of chlorine (Cl2) is 70.90 g/mol. The molar mass of CH2Cl2 can be calculated by adding up the molar masses of carbon (C), hydrogen (H), and two chlorine atoms (Cl):
Molar mass of carbon (C) = 12.01 g/mol
Molar mass of hydrogen (H) = 1.01 g/mol
Molar mass of Cl2 = 2 * 35.45 g/mol = 70.90 g/mol
Molar mass of CH2Cl2 = (12.01 g/mol * 1) + (1.01 g/mol * 2) + (35.45 g/mol * 2) = 84.93 g/mol
Next, you can calculate the percent by mass of chlorine in CH2Cl2 by dividing the molar mass of Cl2 by the molar mass of CH2Cl2 and multiplying by 100:
Percent by mass of chlorine in CH2Cl2 = (70.90 g/mol / 84.93 g/mol) * 100 = 83.43%
So, your calculation of 83.5% is very close to the correct answer of 83.43%.
To calculate the percent by mass of chlorine in CH2Cl2, you need to consider the molar masses of both chlorine and the CH2Cl2 molecule.
To begin, calculate the molar mass of CH2Cl2. The molar mass of carbon (C) is 12.01 g/mol, hydrogen (H) is 1.01 g/mol, and chlorine (Cl) is 35.45 g/mol. Since CH2Cl2 has two carbon atoms, two hydrogen atoms, and two chlorine atoms, you can calculate its molar mass as follows:
Molar mass of CH2Cl2 = (2 x molar mass of carbon) + (2 x molar mass of hydrogen) + (2 x molar mass of chlorine)
= (2 x 12.01 g/mol) + (2 x 1.01 g/mol) + (2 x 35.45 g/mol)
= 24.02 g/mol + 2.02 g/mol + 70.9 g/mol
= 96.94 g/mol
Now, to determine the percent by mass of chlorine in CH2Cl2, divide the molar mass of chlorine (70.9 g/mol) by the molar mass of CH2Cl2 (96.94 g/mol) and multiply by 100:
Percent by mass of chlorine = (molar mass of chlorine / molar mass of CH2Cl2) x 100
= (70.9 g/mol / 96.94 g/mol) x 100
= 73.2%
Therefore, the correct percent by mass of chlorine in CH2Cl2 is approximately 73.2%, not 83.5% as you previously calculated.