Introductory Chemistry For Today
8th Edition
ISBN: 9781285644561
Author: Seager
Publisher: Cengage
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2. Do the following calculations and use the correct number of significant figures in your answers. Assume all numbers are the results of measurements.
a. 0.208 + 4.9 + 1.11
b. 228 + 0.999 + 1.02
c. 8.543 − 7.954
d.(3.2 × 10−2) + (5.5 × 10−1) (hint: Write in the decimal form first, then add.)
e. 336.86 − 309.11
f. 21.66 − 0.02387
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Question 21
Make the following calculation and report your answer to the correct number of significant figures rounding the result if necessary.
(8.811 +3.1379)/48.61
meaning add 8.811 to 3.1379 and then divide by 48.61
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Express each answer in scientific notation in the units indicated.a. (1.26 × 1 0 4 kg) + (2.5 × 1 0 6 g) in kgb. (7.06 g) + (1.2 × 1 0 -4 kg) in kgc. (4.39 × 1 0 5 kg) - (2.8 × 1 0 7 g) in kgd. (5.36 × 1 0 -1 kg) - (7.40 × 1 0 -2 kg) in g
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- An antacid tablet weighing 0.853 g contained calcium carbonate as the active ingredient, in addition to an inert binder. When an acid solution weighing 56.519 g was added to the tablet, carbon dioxide gas was released, producing a fizz. The resulting solution weighed 57.152 g. How many grams of carbon dioxide were produced?arrow_forwardDo the following calculations to the correct number of significant figures: MUST follow the rules of SIGNIFICANT figures a.) 432/7.3-28.523 b.) 0.004 + 0.09879 c.)87.6 + 9.888 +2.3 + 100.77 d.) 5.01 x 105/7.8 x 102arrow_forwardNo need to explain. Just give the answers directly. Thank you. 1. If your final answer is 4.5023485 grams, what will you input as your final answer? 2. Round off 0.274 to two (2) significant figures 3. Round off 20.0847 to two (2) significant figuresarrow_forward
- solve for the follwing probelms stating answers to the proper number of significant figures. use scientific notation when it is indicated for the answers. (2.37 * 10 ^ 3)(8.88 * 10 ^ 4)arrow_forwardDo the indicated arithmetic and give the answer to the correct number of significant figures. I. II. 0.71 + 92.2 III. 934 × 0.00435 + 107 IV. (847.89 - 847.73) + 14673arrow_forward4. The density of a proton is approximately 4.0 x 1014 g/cm°. If the mass of the proton is 1.7 x 1024 g, calculate its volume. 4 b. Using the volume of a sphere equation, determine the radius of the proton in centimeters (cm). The volume of a sphere: V = Tr. (T= 3.14159) 4 c. Convert this answer to nanometers (nm).arrow_forward
- Someone invents new units of measurement: grobs, hulks, and blubs. They define that 1 hulk is equal to exactly 103 grob, and that 7 blubs is exactly 377 hulks. How many blubs are in 59.7 grob? O 3.22x106 blub 6.35x10-9 blub 1110 blub 158 blub O 15.8 blubarrow_forwardAssignment/take Covalent Activity.do?locator=assignment-take $ 4 Submit Answer [Review Topics] [References] Use the References to access important values if needed for this question. a. When 68.938 and 17.6 are added, the answer should be based on 2 significant figure(s). Enter the answer with the correct number of digits. 68.938 +17.6 = 104.54 decimal place(s) b. When 99.137 is divided by 44.926, the answer should be based on 2✔ significant figure(s) Enter the answer with the correct number of digits. 99.137 44.926= 2.21 F4 % 5 Retry Entire Group 4 more group attempts remaining F5 Cengage Learning Cengage Technical Support 6 MacBook Air F6 & 7 A F7 * CO ㅊ입 ▷II F8 ( 9 4 F9 ) A O F10 VOTING NOVE us.shein.com SHEIN X VACA CONTEST art would you II Previous Email Instructor F11 + 11arrow_forwardAmmonia (NH,) chemically reacts with oxygen gas (0,) to produce nitric oxide (NO) and water (H,o). What mass of water is produced by the reaction of 7.5 g of oxygen gas? Be sure your answer has the correct number of significant digits. x10arrow_forward
- How many significant figures does 3.005 have?arrow_forwardDo the following calculations to the correct number of significant figures: a.) 453/2.031 b.) 432/7.3-28.523 c.) 5.01 x 105/ 7.8 x 102 d.) 1459.3 + 9.77/ 4.32arrow_forwardGreen plants use light from the Sun to drive photosynthesis. Photosynthesis is a chemical reaction in which water (H₂O) and carbon dioxide (CO₂) chemically react to form the simple sugar glucose (C6H₁206) a and oxygen gas (0₂). What mass of oxygen gas is produced by the reaction of 5.55 g of carbon dioxide? Round your answer to 3 significant digits. 10 x10 Xarrow_forward
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