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A student is given 1,2253 g of an unknown copper compound. Using magnesium to displace it,...
A student is given 1.3397 g of an unknown copper compound. Following the isolation by displacement...
A student is given 1.3397 g of an unknown copper compound. Following the isolation by displacement by Mg, 0.7015 g of Cu metal is recovered. A.What is the percentage of Cu in the sample? B. What is the formula weight of the compound?
A student is given 1.7307 g of an unknown copper compound. following the isolation by displacement...
A student is given 1.7307 g of an unknown copper compound. following the isolation by displacement by Mg, 0.6577 g of Cu metal is recovered. What is the formula weight of the compound? (Assume one mole of the compound contains one mole of copper)
2. Define the following: a. acid-base reaction b. displacement reaction c. oxidation-reduction reaction d. weak electrolyte...
2. Define the following: a. acid-base reaction b. displacement reaction c. oxidation-reduction reaction d. weak electrolyte 115 A Sequence of Chemical Reactions 3. PPPPPPPPPP Identify the following equations as single or double displacement, redox, acid-base, combination, or decompostion reactions. Some may fit in more than one category. a. Cu(s) + 4HNO, (aq) → Cu(NO),(aq) + 2NO, + 2H,0 Mg(s) + H.SO(aq) - MgSo. (aq) + H (6) CuO(s) + HCl(aq) → Cuci (aq) + H,000 d. Cu(NO),(aq) + 2NaOH(aq ->...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 343 nm is 0.456 in a 1.000 cm cuvette. The molar absorptivity for this compound at 343 nm is €343 = 5721 M-?cm-1. What is the concentration...
2. A student prepared a stock solution by dissolving 15.0 g of NaOH in enough water...
2. A student prepared a stock solution by dissolving 15.0 g of NaOH in enough water to make 150. mL of a stock solution. She then took 22.5 mL of the stock solution and diluted it with enough water to make 250. mL of a working solution. A. What is the molar concentration of NaOH in the stock solution? B. What is the molar concentration of NaOH in the working solution? C. How much of the working solution will she...
An unknown amount of a compound with a molecular mass of 284.04 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 284.04 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 347 nm is 0.472 in a 1.000 cm cuvet. The molar absorptivity for this compound at 347 nm is ?347=6023 M−1cm−1. What is the concentration of the...
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g)...
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) What evidence of reaction would you see based on this balanced reaction? The solution cools down Solid formation Bubbles form in solution A color change In the lab, a student measures a teaspoon of an unknown liquid. The teaspoon of liquid has a mass of 6.84 g and a volume of 4.48 ml. How many teaspoons would be in 1.77 kg of this unknown...
2. A student prepared a stock solution by dissolving 15.0 g of NaOH in enough water...
2. A student prepared a stock solution by dissolving 15.0 g of NaOH in enough water to make 150. mL of a stock solution. She then took 22.5 mL of the stock solution and diluted it with enough water to make 250. mL of a working solution. (5 pts. each) A. What is the molar concentration of NaOH in the stock solution? B. What is the molar concentration of NaOH in the working solution? C. How much of the working...
29,31,32 please 29) A student prepared a stock solution by dissolving 15.0 g of KOH in...
29,31,32 please
29) A student prepared a stock solution by dissolving 15.0 g of KOH in enough water to make 150 mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution? A) O. 411 M B) 0.534 M C) 1.87 M D) 2.43 M 30) The mixing of which pair of...
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to...
1. A solution is made by dissolving 3.875 g of magnesium chloride in enough water to make 200.0 mL of solution. Calculate the molarity of magnesium chloride solution. A. 0.04070 M B. 2.03510-4 M C. 0.2035 M D. 0.3242 M E. 8.14010-3 M 2. How many grams of Na2SO4 (MM 142.04 g/mol) are in 250. mL of a solution that has a concentration of 0.115 M? A. 4.08 g B. 2.02 g C. 6.25 g D. 1.14 g E. 3.07...
2. Define the following: a. acid-base reaction b. displacement reaction c. oxidation-reduction reaction d. weak electrolyte 115 A Sequence of Chemical Reactions 3. PPPPPPPPPP Identify the following equations as single or double displacement, redox, acid-base, combination, or decompostion reactions. Some may fit in more than one category. a. Cu(s) + 4HNO, (aq) → Cu(NO),(aq) + 2NO, + 2H,0 Mg(s) + H.SO(aq) - MgSo. (aq) + H (6) CuO(s) + HCl(aq) → Cuci (aq) + H,000 d. Cu(NO),(aq) + 2NaOH(aq ->...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 343 nm is 0.456 in a 1.000 cm cuvette. The molar absorptivity for this compound at 343 nm is €343 = 5721 M-?cm-1. What is the concentration...
In the reaction of magnesium metal with hydrochloric acid: Mg(s) + 2HCl(aq) --> MgCl2(aq) + H2(g) What evidence of reaction would you see based on this balanced reaction? The solution cools down Solid formation Bubbles form in solution A color change In the lab, a student measures a teaspoon of an unknown liquid. The teaspoon of liquid has a mass of 6.84 g and a volume of 4.48 ml. How many teaspoons would be in 1.77 kg of this unknown...
29,31,32 please
29) A student prepared a stock solution by dissolving 15.0 g of KOH in enough water to make 150 mL of solution. She then took 15.0 mL of the stock solution and diluted it with enough water to make water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution? A) O. 411 M B) 0.534 M C) 1.87 M D) 2.43 M 30) The mixing of which pair of...
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