A student was working with washing soda (Na2CO3) for his science fair experiments. If he used 362 g of Na2CO3 (MM = 106 g/mol) how many moles of sodium are present in his sample?
_________ mol Na. Do NOT enter unit and report your final answer with 3 SFs.
362g * 1mole/106g = 362/106 mole (of Na2CO3)
now double that, since each molecule has 2 Na atoms
so i got 362/106 = 3.411509434..
what do I do next? Should Multiply that by 2?
3.411509434 x 2?
To find the number of moles of sodium (Na) present in the sample, we need to first calculate the molar mass of sodium (Na). Sodium has an atomic mass of approximately 22.99 g/mol.
Given:
Mass of Na2CO3 = 362 g
Molar mass of Na2CO3 = 106 g/mol
To calculate the moles of sodium, we will use the following equation:
moles of Na = (mass of Na2CO3 / molar mass of Na2CO3) x (2 moles of Na / 1 mole of Na2CO3)
First, let's calculate the moles of Na2CO3:
moles of Na2CO3 = (mass of Na2CO3 / molar mass of Na2CO3)
= (362 g / 106 g/mol)
= 3.4150943396 mol Na2CO3 (approximately)
Now, we can calculate the moles of sodium:
moles of Na = (3.4150943396 mol Na2CO3) x (2 moles of Na / 1 mole of Na2CO3)
= 6.8301886792 mol Na (approximately)
Therefore, there are approximately 6.830 mol of sodium (Na) present in the student's sample.
The final answer, reported with 3 significant figures, is: 6.83 mol Na.