Ethanol is a common laboratory solvent and has a density of 0.789 g/mL. What is the mass, in grams, of 127 mL of ethanol? mass: g

Measurement and Matter Adding or subtracting and multiplying or dividing measurements 0/3 B A chemistry student must write down in her lab notebook the concentration of a solution of potassium chloride. 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: 1.500 g She put some solid potassium chloride into the graduated cylinder and weighed it. With the potassium chloride added, the cylinder weighed 40.22 g. She added water to the graduated cylinder and dissolved the potassium chloride completely. Then she read the total volume of the solution from the markings on the graduated cylinder. The total volume of the solution was 172.08 mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits. A Om g·mL -1 □×1 x10 x 5

A sample of vinegar (20.0000 g) contains 1.0763 g of acetic acid. What it the mass% of acetic acid in the vinegar? Write your answer in standard notation with the correct number of significant figures. You do not need to include units.

When 50. mL of 5.4 M NaCl is diluted to a final volume of 300. mL, what is the concentration (M) of NaCl in the diluted solution?  Report your numeric answer only and to the correct number of significant figures.