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360 solutions

Mole Concept

Q. How many moles of pyridine (C5H5N) are contained in 3.13 g of pyridine? A) 0.0396 B) 25.3 C) 0.319 D) 0.00404 E) 4.04 x 10^3. How do I get the correct answer?

Solved • Mar 31, 2020

Mole Concept

Q. Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is Zn^2+(aq) + 2e^- → Zn(s) For a large batch of nails, a manufacture needs to plate a total zinc mass of 2.10 kg on the surface to get adequate coverage. How many moles of zinc are in 2.10 kg of zinc? Express your answer to three significant figures and include the appropriate units.

Solved • Mar 4, 2020

Mole Concept

Q. Redox titration are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide, H2O2, can be titrated against a solution of potassium permanganate, KMnO4. The following equation represents the reaction: 2KMnO4(aq) + H2O2(aq) + 3H2SO4(aq) → 3O2(g) + 2MnSO4(aq) + K2SO4(aq) + 4H2O(l). A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. How much H2O2 was dissolved if the titration required 14.8 mL of the KMnO4 solution? Express your answer numerically in grams.

Solved • Mar 13, 2020

Mole Concept

Q. A volume of 90.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4). What was the molarity of the KOH solution if 23. 2 mL of 1.50 M H2SO4 was needed? The equation is 2KOH(aq) + H2SO4(aq) → K2SO4(aq) + 2H2O(I). Express your answer with the appropriate units.

Solved • Mar 13, 2020

Mole Concept

Q. Treatment of old metal with BrF3 and KF produces Br2 and KAuF4, a salt of gold. Find the mass of the gold salt that forms when a 73.0 - g mixture of equal masses of all three reactants is prepared.

Solved • Mar 13, 2020

Mole Concept

Q. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 575 mL of a solution that has a concentration of Na^+ ions 1.30 M? Express your answer to three significant figures and include the appropriate units.

Solved • Mar 13, 2020

Mole Concept

Q. When solutions of silver nitrate and magnesium chloride are mixed, silver chloride precipitates out of solution according to the equation 2AgNO3(aq)+MgCl2(aq) → 2AgCl(s) + Mg(NO3)2(aq) What mass of silver chloride can be produced from 1.21 L of 0.237 M solution of silver nitrate? Express your answer with the appropriate units. The reaction described in Part A required 3.02 L of magnesium chloride. What is the concentration of this magnesium chloride solution? Express your answer with the appropriate units.

Solved • Mar 13, 2020