Part A Calculate the number of moles of are no molecules of B at time Review 1 Constants l Periodic Table B at 10 min, assuming that there Consider the following hypothetical aqueous reaction: A(a)+B(aq). A flask is charged with 0.065 mol of A in a total volume of 100.0 mL. The following data are collected zero. Express your answer using two significant figures. Time (min) 0 10 20 30 40 Moles of A 0.065 0.051 0.042 0.036 0.031 ΑΣφ nB Submit Request Answer Part B Calculate the number of moles of B at 20 min, assuming that there are no molecules of B at time zero. Express your answer using two significant figures. ΑΣφ 72B P Pearson 12:02 a, m 19 02/2019 7

Known Molarity of NaOH (from the bottle), M 0.DLO897moilk Trial 1 Trial 2 Trial 3 Volume of vinegar in flask, mL 10.00 mL 10.00 mL 10.00 ml Volume of vinegar in flask, L (watch sig fig) Just change mL above to L 13005 ML 15.29mL 549ML 15.29ML Final burette reading, mL 251 mL 2077ML Initial burette reading, mL Volume of NaOH used, mL (subtract initial from final) Molarity of HC2H3O2, M (calculate this below for all 3 trials, then write answers in the boxes) Average Molarity of HC2H3O2, M Show your Molarity calculations for all three trials below. Watch the Post lab video for instructions. Put the final answer for molarity of the vinegar in the table above. It will be a small number. (trial 1) (trial 2)

Remaining Time! 02:29:4. Consider the balanced chemical equations shown below. When a 6.00 g sample of a mixture of iron (Fe) and aluminum (Al) is treated with excess HCl(aq), 0.177 moles of H2 are obtained. What is the mass percentage of Fe in the original mixture? Choose the closest answer. Fe(s) + 2 HCI(aq) FeCl2(aq) - + H2(g) 2 Al(s) +6 HC((aq) 2 AICI3(aq) + 3 H2(g) 96 % 69 % 47 % 33 % 17 % Rack Question Menu - O O

How do I find the amount of mols dispensed in NaOH, with the correct amount of significant figures?

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Subject is Environmental Engineering Please do part d

Remaining Time: 1 hour, 01 minute, 47 seconds. * Question Completion Status: QUESTION 2 The number of water molecules in 2.3 mg of water is O 6.02 x 1023 O 77.0 x 1023 O 7.7 x 1023 O 7.7 x 1019 none of the above QUESTION 3 A ctudent makes a colution bu discolvina 254a ofNDOH int0 450 gof water Wh. Click Save and Submit to save and submit. Click Save All Answers to save all answer ere to search DELL

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In the reaction: 2NaOH(aq) + H2SO4(aq) → 2H2O(l) + Na2SO4(aq), what volume of 0.25 M NaOH would be needed to exactly react with 15 cm3 0.50 M H2SO4? Select one: a. 60 cm3 b. 15 cm3 c. 30 cm3 d. 7.5 cm3

What is the 'Theoritical Yield' in moles and grams of calcium hydroxide