Homework Answers
Q12.
volume of KOH = 250ml
= 0.25L
molarity of KOH = 2M = 2 moles/L
no of moles of KOH = molarity * volume in L
= 2mole/L*0.25 L
= 0.50moles
0.50>>>>answer
Q13.
[HCl] means molar concentration of HCl
The molar concentration units are moles/L
the molar concentration of HCl in units of moles/L >>>>>>answer
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Question 12 1 pts This is a review from general chemistry that was reviewed again in...
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Question 38 2.5 pts Suppose 19.2 mL of 0.489 M HCl was used to titrate an...
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answer all questions
ral Chemistry Concept 5 pts Question 1 Balance the chemical equation shown below, Indicate the stoichiometric coefficients for the reaction. Do not leave answer spaces blank if the coefficient is one (1). AIBrg(aq)+ HBr(aq)- Al(s)+ H2(g) The balanced equation will then be used in the following two questions. 5 pts Question 2 Using the balanced chemical equation from the previous question, how many moles of H2(g) will be formed from 6.24 moles of HBr. Your answer will...
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12. Molarity, M, is defined as A. moles of solute dissolved in 1 mol of solvent. B. moles of solute dissolved in 1 kg of solvent. C. moles of solute dissolved in 1 L of solvent. D. moles of solute dissolved in 1 L of solution. E. moles of solute dissolved in the solution. 13. What volume of 2.50 M NaOH (40.00 g/mol) contains 0.100 mole of NaOH? A. 0.250 L D. 0.250 mL B. 40.0 mL E. 0.0400 mL...
Acid - Base Titration Experiment ACID-BASE TITRATION CHEM 1111 Name Date: Post - Laboratory Review Questions and Exercises DUE AFTER COMPLETING LAB. ANSWER IN THE SPACE PROVIDED 1. Write the Molecular, Complete, and Net equations for the neutralization reaction of HC and No. 2. How many milliliters of 0.50 M Phosphoric acid, H,PO.. are required to neutralize 25,0 mL of 0.50 M NaOH? 3. Why should you plan to start the titration with the acid and base burettes filled exactly...
Question 38 2.5 pts Suppose 19.2 mL of 0.489 M HCl was used to titrate an unknown sample of KOH (molar mass 56.11 g/mol). What mass of KOH was in the sample? The balanced chemical equation is: HCI + NaOH- NaCl + H20 O 0.114g O 0.527 g O 0.437 g 0 3.42 g
Question 13 Calculate the amount of dissolved oxygen (ppm 02) using the following data: • Sample volume (mL) = 224.893 • Buret Reading, initial (mL) = 3.581 • Buret Reading, final (mL) = 18.25 • Volume of Na2S203 dispensed (mL) = • Average molar concentration of Na2S203 (mol/L) = 0.0219 • Moles of Na2S203 dispensed (mol) = • Moles of 13° reduced by S2032-(mol) = • Moles of O2 (mol) = • Mass of O2 (mg) • Dissolved oxygen, ppm...
General Chemistry Workshop 9: The Mole The mole is the unit of measurement for an amount in chemistry and physics. It is defined as the amount of sample that contains as many items as there are atoms in 12 grams of carbon 12 ( isotope). The number of items in 1 mole is called the Avogadro's number NA - 6.022141 x 100 1/mol Mole in science, just like a dozen in our everyday life, allows us to quickly count or...
0.8 pts Question 5 Complete neutralization of 25.00 mL of 0.15 15 M H2SO4 solution requires moles of KOH and forms grams H2O. (Hint: write the balanced equation first) (Report your answer with 4 significant figures. Do NOT express your answer in scientific notation) (Molar Mass H2O = 18.016 g/mol)
Question 6 1 pts What is the molarity of a solution made by adding 2.213 grams of KHP (MM=204.2 g/mol) to 50 mLs of water? Question 5 2 pts Look again at the simulation page. Notice how we know the exact concentration (in M) of KHP but we don't know the exact concentration of NaOH and instead only have a general number (about 1M NaOH). Using your answers to the questions above and the fact that moles of acid =...
Lecture Homework Chapter 09 1 of 3 Review Constants Periodic Table of Concentration: Molarity and Mass Percent ution (% or wt%) Concentration values can erve as conversion factors that allow you to onvert between the amount of solute and its corresponding amount of solution Examples of anits of concentration are shown below for an equivalent ratio of potassium iodide (KI) amount over solution amount Part B Gastric acid pH can range from 1 to 4 and most of the acid...
answer all questions
ral Chemistry Concept 5 pts Question 1 Balance the chemical equation shown below, Indicate the stoichiometric coefficients for the reaction. Do not leave answer spaces blank if the coefficient is one (1). AIBrg(aq)+ HBr(aq)- Al(s)+ H2(g) The balanced equation will then be used in the following two questions. 5 pts Question 2 Using the balanced chemical equation from the previous question, how many moles of H2(g) will be formed from 6.24 moles of HBr. Your answer will...
References Mailings Review View 1) A bottle on the shelf is labeled 0.125 M HNO, (HNO, has a molar mass of 63.02 g/mol) (a) of measure out 30.0 mL of that solution, what mass of HNO, does it contain? (b) What volume of that solution should I measure if I have a reaction that requires 0.0620 mol of HNO3? 2) If I dissolve 10.0g of sodium phosphate, Na PO: (molar mass 163.95 g/mol), in a total volume of 500.0 mL...
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