Question

24. Add the following measurements and Sweet the CORECLumber of significant dicits (7.77. 11.666g and 149) 25 Divide 124.7 g by 2.25 ml, and express your swer to the correct number of significant digits. SOLVE THE FOLLOWING PROBLEMS AND BE SURE YOU SHOW ALL OF YOUR WORK 26. Convert 23. 46 m to cm and to km. 27. A rectangular block of metal has a mass of 39.589 g and measures 5.10 cm by 2.50 cm by 1.15 cm. Find the density of the block 28. An element has 3 isotopes: 92.28 % with mass 27.9866 amu, 4.67% with mass 28.9866 amu, and 3.05% with mass 29.9832 amu. Find the average atomic mass and use the Periodic Table to identify the clement. 29. A chemistry teacher has 5 classes a day with 24 students in each class. The teacher divides each class of students in to groups of 3 to do labs. On a particular lab day each lab group will need 4.8 g of sodium chloride and 11.4 ml of silver nitrate. How many total grams of sodium chloride and how many mL of silver nitrate will the teacher need to set out to cover all the lab groups that will be doing the lab that day? 30. Use the Periodic Table to complete the following radioactive decay equations. 82210 Pb-> -1°B+ 92 238 U 24 Het-

Answer 1

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24 Given numbers are 14.99 7.779 11.666g and Sum of three numbers = 7.779 +1 1.666 g + 14.99 - 34.3369 In addition and subtraction of num I significant figures the result cannot be more precise than the least precise measurement. Sum 39.3369 but in the given numbers only one signiftcant digit after decimal, therefore result will also contain one significant digit after decimal. Rounding off aerule to one deimal point Lissum = 34.39 D Given, divide 124.7g by 2.25 mL division = 124.79 = 55:422 In division and multiplication, the result should be expressed in the number of significant figures which is equal to least number of significant figures in the operands. result here should contain 3 significant figures. loesult = 55.41 CS Scanned with CamScanner