A chemytry student must write down in her iab notebook the concentration of a solution of sodium thlosulfate. The concentration of a solution equals the mass of what's dissohved divided by the total volume of the solvtion. Here's how the student prepared the solvtion: - The label on the graduated cylinder says: - She put same solid sodium thlosulfate into the graduated cylinder and weighed it. With the sodium thiosulfate added, the cylinder weighed 70 .96. g. - She added water to the graduated cylinder and dissolved the sodium thiosulfate completely. Then she read the total volume of the solution from the markings on the graduated cylindec. The total volume of the solution was 98.7mL. What concentration should the student write down in her lab notebook? Be sure your answer has the correct number of significant digits