Answer:
0.965 grams.
Step-by-step explanation:
To calculate the mass of Na₂SO4, we can use the formula:
mass = moles x molar mass
First, let's calculate the number of moles of Na₂SO4 in 435.2 mL of 0.0156 M solution:
moles = volume (in L) x molarity
moles = 0.4352 L x 0.0156 mol/L
moles = 0.0067872 mol
The molar mass of Na₂SO4 is 142.04 g/mol, so we can calculate the mass of Na₂SO4 as:
mass = moles x molar mass
mass = 0.0067872 mol x 142.04 g/mol
mass = 0.965 g
Therefore, the mass of Na₂SO4 used to prepare 435.2 mL of 0.0156 M Na₂SO4 solution is 0.965 grams.