I looked up how to solve it but my answer is coming out wrong. I don't know what i'm doing wrong please help!.Now if your lab partner determined that there were 4.030 x 1020 atoms of H in an unknown sample of C2H4Cl2, how many milligrams would the unknown sample weigh?
Thanks, Bella :)
To find the weight of the unknown sample, we first need to understand the relationship between the number of atoms and the weight of the sample.
The atomic mass of hydrogen (H) is approximately 1.008 grams/mole. We can use this information to convert the number of atoms of hydrogen to moles.
Now, we know that 1 mole of any substance contains Avogadro's number of particles, which is 6.022 x 10^23 particles/mole. With this conversion factor in mind, we can determine the number of moles of hydrogen in the sample.
To find the weight of the unknown sample, we need to multiply the number of moles of hydrogen by the molar mass of the entire compound C2H4Cl2. The molar mass can be calculated by adding up the atomic masses of each element in the compound.
Carbon (C) has an atomic mass of approximately 12.01 grams/mole, hydrogen (H) has an atomic mass of approximately 1.008 grams/mole, and chlorine (Cl) has an atomic mass of approximately 35.45 grams/mole. Since there are two carbon atoms, four hydrogen atoms, and two chlorine atoms in the compound, we can calculate the molar mass as follows:
Molar mass = (2 * carbon atomic mass) + (4 * hydrogen atomic mass) + (2 * chlorine atomic mass)
Once we have the molar mass, we can multiply it by the number of moles of hydrogen to find the weight in grams. Finally, we can convert the weight from grams to milligrams by multiplying by 1000.
Here's the step-by-step breakdown:
1. Calculate the number of moles of hydrogen using Avogadro's number:
Moles of H = (4.030 x 10^20 atoms) / (6.022 x 10^23 atoms/mole)
2. Calculate the molar mass of C2H4Cl2:
Molar mass = (2 * carbon atomic mass) + (4 * hydrogen atomic mass) + (2 * chlorine atomic mass)
3. Multiply the number of moles of hydrogen by the molar mass of C2H4Cl2 to get the weight in grams:
Weight (g) = Moles of H * Molar mass of C2H4Cl2
4. Convert the weight from grams to milligrams:
Weight (mg) = Weight (g) * 1000
By following these steps, you should be able to find the correct weight of the unknown sample in milligrams.