A chemist prepares a solution of sodium carbonate (Na₂CO,) by measuring out 7.5 µmol of sodium carbonate into a 500. mL. volumetric flask and filling the flask to the mark with water. Calculate the concentration in μmol/L of the chemist's sodium carbonate solution. Round your answer to 2 significant digits. 0 mol L 0.8

A lab prepared a solution of sulfuric acid with a volume of 5.0x10-4 m3. The solution is further concentrated to the half of the original volume, which is used to neutralize a potassium hydroxide solution. The potassium hydroxide solution has a volume of 30 mL, contains 30 g water, and has a density of 1.0141 g/cm3. What is the molarity of sulfuric acid in the concentrated solution? (The final answer keeps 4 digits after decimal. Please do NOT use scientific notation.)

2. A student dissolves 0.888 grams of a solute into water. The volume of the solution is 10.55 mL. What is the percent mass/volume of the solution?

O CHEMICAL REACTIONS Solving limiting reactant problems in solution Suppose 1.75 g of potassium nitrate is dissolved in 250. mL of a 48.0 m Maqueous solution of sodium chromate. Calculate the final molarity of nitrate anion in the solution. You can assume the volume of the solution doesn't change when the potassium nitrate is dissolved in it. Be sure your answer has the correct number of significant digits. OM x10 3/5 X

Suppose 4.47 g of barium acetate is dissolved in 350. mL of a 69.0 m M aqueous solution of ammonium sulfate. Calculate the final molarity of barium cation in the solution, You can assume the volume of the solution doesn't change when the barium acetate is dissolved in it. Round your answer to 3 significant digits. | M

Suppose 2.61g of zinc chloride is dissolved in 150.mL of a 70.0mM aqueous solution of potassium carbonate. Calculate the final molarity of chloride anion in the solution. You can assume the volume of the solution doesn't change when the zinc chloride is dissolved in it. Round your answer to 3 significant digits.

A chemist adds 455.0 ml. of a 3.4M silver nitrate (AgNO, solution to a reaction flask. Calculate the millimoles of silver nitrate the chemist has added to the flask. Round your answer to 2 significant digits. Immol

2.93 g Measured Volume of Water: 100.0 mL each question with correct significant figures and units. You must show calculations for determining each quantity. If necessary, use the molar mass of NaCI = 58.44 g/mol. You will be asked to show your work for each question. A.Determine the number of moles of NaCI in the solution B.Determine the number of moles of all solutes (both cations and anions) from the number of moles of NaCI that you determined above. C. Determine the mass (in kg) of solvent (assume that the density of water is 1.000 g/mL). D. the molality of all solutes.

Calculate the molarity of each of the following solutions. Round each of your answers to 3 significant digits. Part 1 of 3 6.59 g of methanol (CH3OH) in 1.50 × 10² mL of solution. Part 2 of 3 M Part 3 of 3 M x10 8.37 g of calcium chloride (CaCl₂) in 2.20 × 10² mL of solution. X M x10 X 7.02 g of naphthalene (C₁0Hg) in 85.2 mL of benzene solution. ☐ Ś x10 X S Ś

A student measures the initial volume of NaOH to be 0.56 mL.  The final volume is measured to be 21.60 mL.  If the concentration of NaOH used is 0.0877 M, how many moles of NaOH were used? Report your answer with four decimals. Enter numbers only; do not enter units.