how many atoms are in a sample of 175 g of sodium (Na)? 4.58 x 1024 or 1.42 x 1027?
mols Na = grams/molar mass.
1 mol conatins 6.02E23.
(175/23) x 6.02E23 = 4.58E24.
To determine the number of atoms in a sample, we need to use the concept of Avogadro's number and molar mass.
First, let's find the molar mass of sodium (Na). The molar mass of sodium is 22.99 g/mol. This means that one mole of sodium atoms weighs 22.99 grams.
Next, we need to convert the given mass of the sample to moles. We can do this by dividing the mass by the molar mass of sodium:
175 g / 22.99 g/mol = 7.61 mol
Now, we can use Avogadro's number, which is approximately 6.022 x 10^23 atoms/mol. By multiplying the number of moles by Avogadro's number, we can find the number of atoms:
7.61 mol × 6.022 x 10^23 atoms/mol = 4.58 x 10^24 atoms
Therefore, the correct answer is 4.58 x 10^24 atoms in a sample of 175 g of sodium (Na).