Mass of empty weighing paper Mass of weighing paper + unknown Mass of unknown Trial 1 Trial II Trial III 0.849 2.90g 0.83g 2.879 2.04g 0.85g 2.90g 2.05g 2.06g Volume of H2SO4 20.00 mL 20.00 mL 20.00 mL Initial buret reading, Vinitial 0.5ml Final buret reading, 32.6ml V final Volume of NaOH used for titration (Vinitial - Vfinal) 32.1m 0.1ml 0.5ml 32.2ml 30.7ml 32.1ml 30.2ml For each trial, determine the % Na2CO3 in the sample and determine an average % Na2CO3 in the sample.

B Brock Sakai : CHEM 1P91 - Fall X b My Questions | bartleby ChemTeam: Combustion Analys X G oxygen molar mass - Google S X B Brock Sakai : CHEM 1P91 - Fall x + Ims.brocku.ca/portal/site/90b45528-0b04-4bd2-85b6-897046a1e998/page/7011eaa9-4e38-4b06-9e15-1973abb58ef6 Version 264 Assign 4 1 / 2 100% + equations are: 3 KC1O (aq) → 2 KC1 (aq) + KCIO; (aq) 4 KC1O3 (aq) → 3 KC1O4 (s) + KCI (aq) What mass of KC1O4 (in kg) can be obtained from 2.80 kg of KC1O when these reactions are carried out? Molar masses (g/mol): KC1O 90.55 KC1O4 138.55 5. An organic compound containing only C, H, and possibly O was subjected to combustion analysis. A sample weighing 0.4161 g yielded 0.686 g CO2 and 0.187 g H2O. What is the empirical formula of the compound? 6. For the complete redox reaction given here, (a) break down each reaction into its half reactions; (b) identify the oxidizing agent; and (c) identify the reducing agent. 2 FeCl3 + Zn –→ ZnCl2 + 2 FeCl2 Give the oxidation number of nitrogen in each of…

Times New. 10 -A A Aa | A m。M.一MH 一 24| T 明叫山国一=。一险<田。 AaBbCcDdE AaBbCcDdE AaBbCcD AaBbCcD. B IUv ab X X 2- A v Normal No Spacing Heading 1 Styles Pane Title Dictate Sensitivity Cr 1. The diameter of a neutral Helium atom is about 1 x 102 pm. Suppose we could line up Helium atoms side by side in contact with one another. Approximately, how many atoms would it take to make the distance from end to end 1 cm? 2. What is the mass number of an iron atom that has 28 neutrons? 3. Determine the number of protons and neutrons in the nucleus of : a) He z=2 A=3 b) He z=2 A=4 c) Mg z= 12 A= 24 d) Mg z=12 A=25 e) Ti z= 22 A=48 f) Br Z= 35 A = 79 Write the annronriate evmbol for each of the followwing: 252 words O Focus English (United States) Page 1 of 2 MacBook Air

A common alkyne starting material is shown below. Predict the major product or missing reagent to complete each reaction. Ignore inorganic byproducts. + esc CI CI ! F1 143,176 @ F2 # 3 31, 80 F3 Select to Draw HCI (1 equiv) DEC 6 $ 4 Q F4 % 5 tv NA 9 F5 A 6 C F6 & 7 A B с D F7 * 8 F8 Cla (1 equiv) Cla (2 equiv) HCI (excess) NaCl (2 equiv) THF Done 9 F9 - . F10 0 F11 27 F12

Section 3 part B

Help 100% 4A To Public Health Ch x * HSC 258 - Major Projec X MindTap - Cengage Lea X C The Illustration To TH d%=55750828934189288909969212&elSBN=9781305657571&id=D1061392007&nbld=21... * Q Search th References Use the References to access important values if needed for this question. For the following reaction, 24.7 grams of sulfur dioxide are allowed to react with 9.95 grams of oxygen gas . sulfur dioxide(g) + oxygen(g) → sulfur trioxide(g) What is the maximum mass of sulfur trioxide that can be formed? grams What is the FORMULA for the limiting reagent? grams What mass of the excess reagent remains after the reaction is complete? Submit Answer

Table 1: Standardization Data Trial 1 Trial 2 O145504 Mass of KHP 04536 Initial burette reading 0.05ML 12.3 ML Final burette reading 12.8 a6.omL Volume of base used ר.12 13.2 mL Data Analysis: KH Cg Hg Da (MOIAR MASS 2041ag) 1. Calculate the molarity of base for each trial. You must use dimensional analysis – show all unit conversions (hint: start with grams of KHP used). Review the balanced equation for KHP and NaOH you wrote in Expt 11 part 1. (204.29 TRIAI 1: 0.4550g. Average: Trial 2: Trial 1: with 1875 mL of your base (use the average

Is the precision of your two trials within 5 %?. Support your answer with calculations

A quia.com/quiz/7898892.html?AP_rand%3D1784472953 UIA FAQ About Log in Subscribe now 30-day free trial Home 201208 Assessment for Scoutlier Significant Figures Calculations Go to 1 - Not answered v Go stion 1 of 20 1. When expressed as 7.5x10^4, only the significant figures of are to.be considered. (1 point) O 7.5 7.05 O 7.005 O None of the, above Submit answer Skip for now Save progress or end quiz

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