# Chemistry

If a solution has a total mass of 26.7g and is 8.36 % by weight in sodium chloride, what mass of sodium chloride is present in the solution?

How many moles of dextrose (C6H12O6) are in 414mL of solution with a concentration of 0.84M?

If an aqueous solution is 7.82 % by weight in sodium chloride and contains 1.07 g of sodium chloride, what mass of water is present in the solution?

What mass in grams of dextrose (C6H12O6) will be required to produce 5.00 L of a 0.31M aqueous solution?

Thank you for helping

1. 1. %w/w = (g solute)*100/mass solution.
Substitute and solve for g solute.

2. mols = M x L = ?

3. See #1 above and solve for mass solution. Then mass solution = mass solvent + mass solute = ? Substitute and solve for mass solvent.

4. mols = M x L = ?
Then mols = grams/molar mass. You know molar mass and mols, solve for grams.

Post your work if you get stuck.

posted by DrBob222
2. Thank you it helped alot

posted by larlee

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