if there are 8.0 mg of Na+ contaminant per liter of water sample, calculate the number of moles of Na+ per liter. Calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L
8.0 mg = 0.0080 g and
moles = grams/molar mass.
0.0080 g/23 = moles and that is moles/L of soln.
A sample that is 100 umol Na/L = 0.100 mol/L so in 1 L you will have 0.100 moles Na^+. Then moles = grams/molar mass. You know moles and molar mass, solve for grams.
if there are 8.0 mg of Na+ contaminant per liter of water sample, calculate the number of moles of Na+ per liter. Calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L
To calculate the number of moles of Na+ per liter, you need to know the molar mass of Na+. The molar mass of Na+ is 22.99 g/mol.
1. Convert the mass of Na+ (8.0 mg) to grams:
8.0 mg = 8.0 × 10^(-3) g
2. Calculate the number of moles using the formula:
moles = mass (in grams) / molar mass
moles of Na+ = (8.0 × 10^(-3) g) / (22.99 g/mol)
Next, to calculate the weight of Na+ in a 1L sample of water that contains 1.00 x 10^2 umol Na+/L, you need to convert umol to moles.
1. Convert the number of umol to moles:
1.00 x 10^2 umol = 1.00 x 10^2 × 10^(-6) mol (since umol means micro moles)
2. Now, multiply the moles by the molar mass of Na+ to get the weight:
weight of Na+ = (1.00 x 10^2 × 10^(-6) mol) × (22.99 g/mol)
Please note that 1L is equivalent to 1 dm³ or 1,000 cm³.