How many atoms of H are in a mixture of 3.49 x 10^23 molecules of H2O and 78.1g of CH3OH?
Could you explain the steps you did for the first part? Do I multiply 3.49 x 10^23 by the mass of H2O?
You have 3.49 x 10^23 molecules of water. There are 2 H atoms per molcule; therefore, 3.49 x 10^23 x 2 = # atoms of H.
Got it! Thanks
To determine the number of atoms of H in the given mixture, you will need to calculate the total number of atoms of H in each compound separately and then add them together.
Let's start by calculating the number of atoms of H in water (H2O). Water consists of two hydrogen atoms (H2) per molecule.
Step 1: Calculate the number of moles of H2O:
To find the number of moles, we will use the formula:
moles = given quantity (in this case, molecules or grams) / molar mass.
The molar mass of H2O is the sum of two times the molar mass of hydrogen (H) and one time the molar mass of oxygen (O). You can find the molar masses on the periodic table.
Molar mass of H2O = 2 * atomic mass of H + atomic mass of O
Step 2: Calculate the number of molecules of H2O to moles of H2O:
Since we are given the quantity as molecules in this case, we need to convert the number of molecules to moles. To do this, we use Avogadro's number, which states that there are 6.022 x 10^23 molecules in one mole of any substance.
moles of H2O = given quantity of H2O molecules / Avogadro's number
Step 3: Calculate the number of atoms of H in H2O:
Since there are two atoms of hydrogen (H) per molecule of H2O, the number of atoms of H is:
atoms of H in H2O = moles of H2O * 2 * Avogadro's number
Repeat this process for CH3OH to find the number of atoms of H in methanol.
Step 1: Calculate the number of moles of CH3OH:
To find the number of moles, we will use the formula:
moles = given quantity (in this case, grams) / molar mass.
The molar mass of CH3OH can be calculated by adding the molar mass of each element present in it (C, H, and O).
Step 2: Calculate the number of grams of CH3OH to moles of CH3OH.
Since we are given the quantity as grams in this case, we need to convert the grams to moles by dividing the given quantity by the molar mass of CH3OH.
moles of CH3OH = given quantity of CH3OH / molar mass of CH3OH
Step 3: Calculate the number of atoms of H in CH3OH:
Since one molecule of CH3OH contains four atoms of hydrogen, the number of atoms of H is:
atoms of H in CH3OH = moles of CH3OH * 4 * Avogadro's number
Finally, add the number of atoms of H in H2O and CH3OH to get the total number of atoms of H in the mixture.
total number of atoms of H = atoms of H in H2O + atoms of H in CH3OH
There will be 3.49 x 10^23 molecules H2O x (2 H atoms/1 molecule H2O) = ?? atoms H.
For CH3OH, mols CH3OH = 71.0/molar mass CH3OH.
1 mol contains 6.02 x 10^23 molecules.
There are 4 H atoms per molecule.
Then add the two together.