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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

Mole Concept

Q. hat amount in moles of F atoms does 4.0 g of SF6 contain

Solved • Mar 27, 2020

Mole Concept

Q. Calculating and using molar mass of diatomic elements

Solved • Mar 26, 2020

Mole Concept

Q. An aluminum atom has a mass of 4.48x10^-23 g and a small airplane has a mass of 5000.0 kg. (a) What is the mass of 1 mole of aluminum atoms? (b) How many moles of aluminum atoms have a mass equal to the mass of a small airplane?

Solved • Mar 26, 2020

Mole Concept

Q. A penny has a mass of 2.50g and the Moon has a mass of 7.35×10^22 kg. Use this information to answer the question below. Be sure your answers have the correct number of significant digits. What is the mass of 1 mole of pennies? How many moles of pennies have a ass equal to the mass of the Moon?

Solved • Mar 26, 2020