school 10

(1) question is in the photo below

A local water retention pond was found to have elevated levels of mercury concentrated as 14 ng per liter. You would like to collect some mercury for your homemade perpetuum mobile machine. How many moles of mercury can you get you collect and process the entire volume of 1250 m3 of the water in the pond? 1.8 x 10-5 moles 4.4 x 10:5 moles 1.8 x 10-2 moles 8.7 x 108 moles 7.6 x 10-5 moles O 4.4 x 108 moles 8.7 x 105 moles

I need help with 6 and 7 (Not honor class) (Not grading)

One mole of a compound weighs 2.93x10-22. Determine the molar mass (g/mol). Group of answer choices 134g/mol 176g/mol 122g/mol 22.7g/mol

Write the correct answer with 1 place after the decimal point What is the molecular mass of C6(N8O4)6

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Select one or more: a. CC14 ☐ b. S0₂ CO₂ O d. CH₂Cl2 1 C. H 1.008 3 Li 6.94 11 4 Be 9.012 12 Na Mg 22.990 24.305 5 B 10.81 13 6 14 7 N 15 8 O 16 9 F 17 CI Al Si 26.982 28.085 30.974 32.06 35.45 2 He 4.003 10 Ne Which of the following compounds is/are polar? You may choose one or more compounds. If there are more than one correct choices, partial points will be given for each correct answer. An incorrect choice will negate all points obtained from the correct choice(s). 18 Ar 39.948

What is a Coefficient used in the formula below? 4Fe, (CO,)s O 2 3. er #3 %24 %23

A 100.0 g sample of gas with a rotten egg smell was found to contain 94.119% S and 5.881% H. What is the empirical formula for the gas? H [Select] ✓S [Select]

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For items 1-4 please refer to the problem posted on the picture.  choose the correct answer correctly. 1. In the above equation, what will be the sum of its coefficients when it is balanced with the smallest possible whole number? A. 4                B. 8              C. 19                  D. 38 2. How many moles of O2 are required with one mole of ethane, C2H6? A. 2.0 moles                               B. 4.0 moles  C. 3.5 moles                               D. 7.0 moles 3. How many moles of CO2 are formed when one mole of O2 is consumed? A. 0.14 mol CO2                    B. 0.57 mol CO2 C. 1.00 mol CO2                    D. 4.00 mol CO2 4. How many moles of CO2 are formed when 5 moles of C2H6 are consumed? A. 2.5 moles CO2               B. 5.0 moles CO2 C. 10.0 moles CO2           D. 20.0 moles CO2

46. In the reaction below, 8.0 g of H2 react with 7.0 g of O2. Which of the following statements is incorrect? 2 H2 + O2 → 2 H20 a. More moles of hydrogen are consumed than moles of oxygen. b. More grams of hydrogen are consumed than grams of oxygen. c. More grams of oxygen are consumed than grams of hydrogen. d. More moles of water are produced than moles of oxygen are consumed. e. More grams of water are produced than grams of oxygen are consumed.

ΠΑ Proto Latan- 4 Be 9.012 12 Ma 26. When the following equation is balanced correctly, what is the coefficient in front of Ba(NO3)2? Ba(NO3)2 + Na3PO4 Ba3(PO4)2 + NaNO3 d. 6 a. 1 b. 2 c. 3 e. 12 .3 B in idon 22)

1. O3 1. NANH, 2. H20 2. Br H =H 3. NaNH2 1. O3 2. H20 1. NANH2 Br 1. O3 2. H20 2. H =H 3. NANH2 4. 1. NaNH2 2. Br 1. NANH2 1. NANH2 Br 2. H =H 2. Br 3. NaNH2 4. Br 1. NANH2 Synthesis

need help with 25

Please help!! 1) 42 g of OCl2 2) 4.30 moles of CCl4 3) 3.76 × 10^34 molecules of SeCl4. Calculate the no. Of chlorine atom in each of the sample.

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

Name: Date: 1. In mammals, lactose (milk sugar) is metabolized to glucose (C₂H₁2O), the key nutrient for generating chemical potential energy. 12 What is the mass percent of each element in glucose? How many grams of carbon are in 16.55 g of glucose? a) 6.714 mass % C, 40.00 mass % H, 53.29 mass % O, 6.620 g C b) 40.00 mass % C, 6.714 mass % H, 53.29 mass % O, 6.620 g C c) 6.620 mass % C, 6.714 mass % H, 40.00 mass % O, 53.29 g C d) 50.00 mass % C, 7.714 mass % H, 5.329 mass % O, 66.20 g C

Determine the percent ammonia, NH3, in Co(NH3)6Cl3, to four significant figures.a. 3.066% b. 8.012% c 17.031% d .8.253%

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Design ab 16 X₂ Layout Α' Α x² 16. A References Aav Po c. H₂ NOV A co Mailings V English (United States) + Br2 -→ 14. What is the molar mass of Ca? Review E V 15. What is the molar mass of H₂SO4? What is the mass of 3 moles of N₂? View 描く 17. How many moles of HF are in 60 grams of HF? Accessibility: Good to go HBr 18. How many moles of NH3 are in 34 grams of NH3? ty Tell me 2↓ ¶ AaBbCcDdE Normal

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1. Solve and choose the correct answer from the given choices: a. How many atoms of tin are found in 3.50 moles of tin? 3.1 x 1024 tin atoms 4.1 x 1024 tin atoms 2.1 x 1024 tin atoms 2. Solve and drag and drop into text the correct answer: The boiling temperature of a liquid is - 8°C. What is its value in Kelvin and Fahrenheit? 225K and 16.8° F 265K and 17.6° F|| 325K and 18.2 F 3. Match the following properties of states of matter as: solid, liquid or gas. Lemonade has a definite volume but takes the shape of container Choose. + The breathing mixture in a scuba tank has no definite volume or shape Choose. Liquid The particles in an ice cube are held in a rigid structure Solid Gas The neon atoms in a lightening display do not interact with each other Choose.. + 4. Would you use the atomic number, mass number or both to determine each of the Following? Match the correct answer. Number of neutrons in an atom Choose... Choose... Number of electrons in an atom Both Mass number Atomic…

A compound contains only Mn and F. The ratio of Mn and F is 2.54 moles of F per 1 mole of Mn. If the empirical formula is expressed at Mnfx, what is the numerial value of x?

: ny F1 ! Q What does a complete balanced chemical equation include? O F2 molar coefficients valence electrons exothermic coefficients 2 endothermic coefficients -0- @ W F3 -Ő+ #m 3 E F4 $ 4 F5 R % F6 T Q F7 6 Y F8 & 7 F9 *00 U 8 H

A 2.37 gram sample of a KCI and KCIO3 mixture was found to contain 0.01611 mol of KCIO3. What is the percent by mass of KCIO3 in the original mixture? Report your answer with three significant figures. A Click Submit to complete this assessment. Question 5 of 5

150 moles of C2H6 is burned with 45% excess oxygen. The amount of Oxygen is. . moles. (Molecular weight of Carbon=12, Molecular weight of Hydrogen=1, Molecular weight of Oxygen=16) Select one: O a. 761.25 O b. 525 O c. 217.5 O d. 150

1. 2. OCH3 + 1. NaOEt 2. CH₂CH₂Cl 3. NaOEt 4. CH₂Br 1. LiAlH, OCH3 NaOCH3 H₂O

1. HNO3, H₂SO4 2. PCC 3. Na₂Cr₂O7, H₂SO4 4. Br₂, FeBr3 5. PBr3 6. H₂C=0 7. 1. LIAIH4 2. H3O*, H₂O 8. HBr 9. H₂O, H* 10. CH3CH₂CH₂CI, AICI3 11. CH3CH₂CH=PPh3 12. Zn-Hg, EtOH, HCI 13. Li, THF 14. 1. CH₂CH₂CH₂MgCl 2. H₂O, H* 15. KMnO4 16. HOCH₂CH₂OH, H₂O* 17. CH3CH₂OH, H* 20. 1. BHs 2. HzOz, NaOH 21. CH3CH₂CH₂Br 18. 1. 2 CH3Li 2. HyO*, H,O 19. 1. CH,CH,CH,Li 2. HyO*, H2O