Gas+Law+Lab+v2

Post-Lab Questions 1. Discuss how each of the following actions would affect the calculated % oxygen in the magnesium oxide compound. Would the percentage be too high, too low, or remain the same? a. The evaporation of water caused "spattering." tion b. Water was not completely removed by evaporation. 2. The white powder often found on objects made of aluminum is aluminum oxide, Al,O, A 5.00 g strip of aluminum is reacted in air, producing an oxide weighing 9.36 g. Calculate the percent oxygen and aluminum in the compound. 3. Aluminum oxide has the empirical formula of Al,O3. a. Calculate the % aluminum in Al,O3, using the chemical formula. b. Calculate the % error for the percent aluminum calculated in question 2. 85 COPYRIGHT 2013 Cengage Learning

Drawing activity. Draw a molecular structure of a section of a snowflake. Use at least 25 molecules of water.

10 moles of NH3 is _____________ times bigger than 2 moles of NH3  answer choices: two times bigger four times bigger three times bigger five times bigger

need help with 25

Question 10 Listen If you have not weighed out enough solid compound on the balance, you should... a) pour more compound in your hand and then add it to the weigh boat on the balance. b) throw out the sample in the trash and start over. c) remove the weigh boat and add more compound, then reweigh the sample. d) throw out the sample in the waste container and start over. e) pour more compound in the weigh boat on the balance.

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QUESTION 1 Indicate whether the following experimental mistake will increase, decrease, or have no effect on the calculated value of R. In adjusting the final water level after the O2 was produced, the student adjusted the levels to the bottom of the water in the beaker and the top of the water in the flask (rather than correctly the top of each). See image below. Select ALL of the correct answers. Delivery Tubing Beaker Florence Flask a. The value of the calculated R is low. b. Water flows from the flask to the beaker. c. The volume measured from the beaker is unaffected. d. The value of the calculated R is high. e. The volume measured from the beaker is low. f. Water does not flow under these circumstances. g. Water flows from the beaker to the flask. h. The value of R is unaffected. O i. The volume measured from the beaker is high.

7 8 9 1 mole CH₁₂0= 1 mole Pb(C₂H₂O₂) = 1 mole Fe₂(Cro), = -9 C₂H,₂06 g Fe (CrO₂), 10. Avogadro's constant was not actually discovered by Avogadro. Who actually calculated Avogadro's constant and when? 11. Why did the discoverer name the constant after Avogadro? What is Avogadro famous for? (C) Bethany Lou < 1 of 1 DELL 78880 # A & 3 4 6 y -9 Pb(C₂H₂0₂)4

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How many grams of C2H4 are in 3.27 moles?   Select one: a. 28.1 g/mol b. 28.054 g/mol c. 28.054 g d. 28.1 g

QUESTION 5 How many atoms of hydrogen are present in 7.85 g of water? O a. 2.62 x 1023 O b.2.34 x 1024 1020 O d. 5.25 x 1023 O e. 9.45 x O c. 1.21 × 1024 Click Save and Submit to save and submit. Click Save All Answers to save all answers.

2.50 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have a molecular molar mass of 192. g/mol, is burned completely in excess oxygen, and the mass of the products carefully measured: product mass 3.44 g carbon dioxide 0.94 g water Use this information to find the molecular formula of X. Check Privecy Explanation Terms of Use 2019 McGraw-Hill Education. All Rights Reserved. 2:06 PM 12/5/2019 99+ O Type here to search hp end home ins prt sc delete 12 f11 f10 fg f8 144 f6 10 esc num lock backspace &

Do numbers 10,11 and 12. Please type it. Also this is not graded.

Please answer 5,6,7,8. I submitted already and only got answer for number 4. Please help with the rest.

A sample of a gaseous binary compound of boron and fluorine weighing 0.794 g is decomposed to give 0.176 g of solid B. In a separate experiment, the molar mass of the compound is determined to be 97.6 g/mol. Determine the molecular formula of the compound. Submit Answer Use the References to access important values if needed for this question. Try Another Version 5 item attempts remaining Enter B before F.

Match the correct number of nitrogens with the correct situation that you see below ✓2 NH4NO3 A. 4 ✓10 HNO3 ✓3 N2 ✓ 8 HCN ķ B. 8 C. 1 D. 3 E. 10 F. 2 G. 6 H. 7

Please correct answer and don't use hand rating

Multiple Choice: How many atoms of carbon-14 are in the average human body given the following four facts: 1. Carbon makes up 23% of the human body by weight. 2. The average human body has a mass of 150 kg. 3. There are approximately 83 moles in every kg of carbon. 4. One in every trillion atoms of carbon is carbon-14.  a. 1,89 X 10 (exponent 15) b. 1,72 X 10 (exponent 15) c. 1,89 X 10 (exponent 16) d. 1,72 X 10 (exponent 16)

What are the values for % Cl and % F, respectively, for Sample II?A. 0.622 and 61.65 C. 38.35 and 0.622B. 61.65 and 38.35 D. 38.35 and 61.65