Given the following data, calculate the percentage of salt in the original mixture.  Include the % unit and two decimal places in your answer. Mass of mixture = 5.426 g Mass of 400 mL beaker = 137.521 g Mass of 400 mL beaker and sand = 139.477 g Mass of 250 mL beaker = 105.691 g Mass of boiling chips = 0.463 g Mass of 250 mL beaker + boiling chips + salt = 108.328 g

A chemist must prepare 775. mL of 1.00 M aqueous calcium bromide (CaBr₂) working solution. He'll do this by pouring out some 7.04 M aqueous calcium bromide stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the calcium bromide stock solution that the chemist should pour out. Be sure your answer has the correct number of significant digits. 0 mL x Ś

A titration of vinegar was conducted using 0.756 M NaOH. In total, 30.54 mL of NaOH were added when the solution turned pink. How many moles of NaOH were involved in the reaction? Write your answer in standard notation with the correct number of significant figures. You do not need to include units.

Measurement and Matter Adding or subtracting and multiplying or dividing measurements 1/3 B A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration of a solution equals the mass of what's dissolved divided by the total volume of the solution. Here's how the student prepared the solution: The label on the graduated cylinder says: empty weight: 7.2 g . She put some solid sodium hydroxide into the graduated cylinder and weighed it. With the sodium hydroxide added, the cylinder weighed 63.517 g. . She added water to the graduated cylinder and dissolved the sodium hydroxide completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 91.0 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. g-mL G

The concentration of an HCl solution is 0.567 g HCl/g of HCl solution (the solution containing BOTH water andHCl). What is the mass of HCl in this solution if there are 67.2 g of solution? Express your answer with 3 significantfigures.

The following test data were obtained for an aqueous solution of calcium chloride. Mass of empty 100-mL graduated cylinder=36.2 g Mass of calcium chloride (Molar mass= 110.98 g/mol) : 5.6 g Volume of the calcium chloride solution in the 100-mL graduated cylinder = 100.0 mL Mass of the calcium chloride solution and the 100-mL graduated cylinder =140.2 g Use the above data to determine: a) The mass % of the calcium chloride solution b) The molality of the calcium chloride solution

A solution of 5.00% glucose (C6,H12,O6) solution is used in many medical settings. If you are given 75.0 g of this solution, how many grams of glucose did you receive? Write the value to the correct significant figures.

One half tsp of table salt (NaCl) weighs aproximately 2.0 grams. (You will need to look up the molar mass for NaCl) There are approximately 237 ml in a cup. Determine the Molarity of the solution 1 cup water with one half tsp table salt. Determine the molarity of this solution using the formula M=g/MM/L. What is the molarity? Show your calculations. (Remember to convert 237 mL to L)

A A chemistry student weighs out 0.130 g of phosphoric acid (H,PO,), a triprotic acid, into a 250. mL volumetric flask and dilutes to the mark with distilled water. He plans to titrate the acid with 0.1200 M NaOH solution. Calculate the volume of NaOH solution the student will need to add to reach the final equivalence point. Round your answer to 3 significant digits. mL x10

Aqueous sulfuric acid H2SO4 will react with solid sodium hydroxide NaOH to produce aqueous sodium sulfate Na2SO4 and liquid water H2O . Suppose 4.90 g of sulfuric acid is mixed with 5.1 g of sodium hydroxide. Calculate the maximum mass of sodium sulfate that could be produced by the chemical reaction. Be sure your answer has the correct number of significant digits.