a chemist weidghed 1.25g of sodum hydroxide ,placed it in a volumetric flask and then added enough deionized water to bring the total volume to 250mL. How many moles of NaOH were added to the volumetric flask
mols = grams/molar mass.
To determine the number of moles of sodium hydroxide (NaOH) added to the volumetric flask, we'll need to use the formula:
moles = mass / molar mass
1. First, we calculate the molar mass of sodium hydroxide (NaOH):
The molar mass of sodium (Na) = 22.99 g/mol
The molar mass of oxygen (O) = 16.00 g/mol
The molar mass of hydrogen (H) = 1.01 g/mol
Therefore, the molar mass of NaOH = (22.99 + 16.00 + 1.01) g/mol = 39.99 g/mol
2. Next, we convert the given mass of NaOH from grams (g) to moles (mol):
moles = 1.25 g / 39.99 g/mol ≈ 0.0313 mol (rounded to four decimal places)
Hence, approximately 0.0313 moles of NaOH were added to the volumetric flask.