exam 2 F2023 (1)

C T X [References) It is sometimes necessary to take powers or roots to solve chemistry problems. eq Take powers and roots as needed on your calculator to complete the following. eq a = 1.335 %3D b = 18.3 c= 4.004 66 %3= Visited =2.02 da %3D req Submit Answer req Leura sidurane unoraaON req Preq Preq 2req 2reg

1-30. How many grams of boric acid, B(OH)3 (FM 61.83), should be used to make 2.00 L of 0.050 0 M solution? What kind of flask is used to prepare this solution?

1 Chemistry Time's Up! What is the number of moles of glucose (C₂H₂O) in 0.500 L solution? ADD FACTOR 1-210 Sections HA LECTU X 0.20 0.500 mL ANSWER 0.020 36.04 1.3 M glucose g glucose mol glucose MacBook Air 1 180.18 of a 0.40 6.022 x 1023 L M RESET PUL C 0.40

What is the solubility of KCI at 80C 150 140 KI 130 120 110 100 NANO3 90 80 70 60 NH4CI KCI NacCl 50 40 30 20 KCIÓ3 10 Ce2(SO4)3 0 10 20 30 40 50 60 70 80 90 100 Temperature (°C) DELL Grams of solute per 100 g H,0 NH37 EONX

M Inbox (21,026) - sarahnasri522 × b Answered: Determine the mass X → C < + app.101edu.co Aktiv Chemistry X b Success Confirmation of Quest x Time's Up! 2 What is the mass percent of water in Ca(NO3)₂.4 H₂O? Provide an answer to two decimal places. G Google 1 4 7 +/- 5 x + 2 3 8 % 6 9 G 0 Submit X C x 100

A pheromone is a type of volatile compound produced by a variety of insect species for chemical communication. These molecules can be used to signal alarm, to attract a mate, or to indicate the presence of food. The presence of 1.00 x 10-8 g of a pheromone can be sensed by another insect within a radius of 0.500 miles. Calculate the density of this pheromone. (1609 m = 1 mile) %3D Calculate the density (g/L) of the pheromone in this cylindrical air space.

Ifa car has an EPA mileage rating of 3.0 x 10 miles per gallon, what is this rating in km L1?1 liter = 1 dm, 1 gallon - 3.785 liter, 1 mile = 1.609 kilometer. O 200 km L1 O 13 km L1 O 11 km L1 O 180 km L1 O 70 km L1 eTextbook and Media Hint Save for Later Attempts: 0 of 2 used Submit Answer e to search f12 IOI 4+ insert 2$ 4. @ %23 & * 7 8. W R T Y U S D H. K pau alt ctr alt 3.

< STARTING AMOUNT X A brine solution is 3.50% NaCl by mass. Given that its density is 1.071 g/mL , determine the quantity of liters of solution that contains 5.00 moles of NaCl 5.00 ADD FACTOR 0.1 *( ) 3.50 10 35.45 Question 29 of 33 1.071 0.01 8.03 x 1022 1000 100 ANSWER 7.80 22.99 0.0156 L solution g NaCl/mL g solution mL solution kg solution g NaCl/g solution 58.44 6.022 x 1023 0.0780 moles of NaCl mol NaCl RESET 0.001 2 1 g NaCl 1.56

1-16. How many grams of methanol (CH3OH, FM 32.04) are contained in 0.100 L of 1.71 M aqueous methanol (i.e., 1.71 mol CH3OH/L solution)?

1-11 Exactly 5.00-mL aliquots of a solution containing phenobarbital were measured into 50.00-mL volumetric flasks and made basic with KOH. The following volumes of a standard solution of phenobarbital containing 2.000 µg/mL of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50, and 2.00 mL. The fluorescence of each of these solutions was measured with a fluorometer, which gave values of 3.26, 4.80, 6.41, 8.02, and 9.56, respectively. (a) Plot the data. *(b) Using the plot from (a), calculate the concentration of phenobarbital in the unknown.

5.50x10-2 M in acetic acid (Ka = 1.8 x 10-5) and 5.50x10-2 M in hydrocyanic acid (Ka = 4.9 x 10-10) Express your answer to two decimal places. pH = ΜΕ ΑΣΦ ? Submit Previous Answers Request Answer

Which volumes below are equivalent to 3 mL. There may be more than a single answer. (1) 1 mole/(0.333 mM) (2) 3000 µL (3) 10° µL (4) 10-3 L (5) 10° nL O none of these O 2, 3, 4 O 2-5 all of these

H CPBA 5 CO H₂ Pd/C 1. NaBH4 2. H3O+ Br NH3 :0 OH

If the [OH] = 5.4 x10-12, the [H*] must be 1.85 x 103 %3D True False

answer 1-10 there are choices above thank u

4. You are trying to determine the volume of your setup according to the procedure in the lab manual. You have determined the following: Mass Standard CaCO3 0.4453 g % CaCO3 Pi Pf Ti Tf 99.6 % 50.5 kPa 129.5 kPa 20.33 °C 21.88 °C What is the volume of the setup in L? The volume is 0.138 L

1 0/1 point Calculate the mass (in g) of oxygen present in a 8.63 g sample of NaC2H3O2 3H2O (MM = 136) that is 62.5% pure. Report the answer to 3 significant figures.

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4:31 PM Time's Up! What is the mass in grams of KBr in 0.400 STARTING AMOUNT X ADD FACTOR 8.43 x 10²² 0.350 39.10 g KBr 3 9.60 x 10-³ 0.140 mol KBr 5.47 7.09 x 102⁰ 1 L L of a 0.350 ANSWER M KBr 0.400 136 M solution? RESET 5 16.7 1.18 x 10-³ g KBr/mol 6.022 X 119 mL

Question 34 A person drinks 1.50 kg of water (H2O) per day. How many moles is this? (Show your work!) For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). 10nt

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1-36. How many milliliters of 3.00 M H2SO4 are required to react with 4.35 g of solid containing 23.2 wt% Ba(NO3)2 if the reaction is So 2+ BaSO4(s)? Ва 3Hew manygrams of 0.491 wt% aqueeusIP are required to provide a50excess te reaet with 250 m£ef 0,023 6 M Th the reaction TH 4+ by hrдо2 1-38. To entertain children between the ages of 2 and 90, I enjoy popping corks from bottles containing vinegar and baking soda pour about 50 mL of vinegar into a 500-mL plastic bottle. Then I wrap about 5 g of baking soda which is sodium bicarbonate NaHCO3) in one layer of tissue and drop the tissue into the bottle. I place a cork tightly in the mouth of the bottle and step back. The chemical reaction generates CO2(g) that pressurizes the bottle and eventually bursts the cork into the air. Everyone smiles I

Answers will vary depending on your particular sample. Keeping in mind that the SI unit for mass is kg, the approximate weight of a bar of chocolate is 1 x 10 kg. What is the approximate mass (using SI mass units) of a grain of sand? О5x 10-3 kg O2.0 x 10' kg O1 x 10° kg O1 x 10-' kg O1x 10-5 kg O 3 kg Submit

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