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Mole Concept

Q. A fertilizer railroad car carrying 34700 gallons of commercial aqueous ammonia (30% ammonia by mass) tips over and spills. The density of the aqueous ammonia solution is 0.88 g/cm What mass of citric acid, C(OH)(COOH)(CH2COOH)2 (which contains three acidic protons) is required to neutralize the spill? 1 gallon = 3.785 L L .

Solved • Mar 25, 2020

Mole Concept

Q. The cost of the entire roll of aluminum foil is $2.25. The area of the entire Al foil roll is 75.0 sq ft, and your foil sample's mass of .5640 g and L= 16.415 cm and W= 12.954 cm. Determine the thickness of your Al foil sample and the cost for each atom of Al in the foil. Use the density of Al as 2.72 g/cm3 and Avogadro's number is 6.022 x 10 (23).

Solved • Mar 18, 2020

Mole Concept

Q. How many moles of ions are released when the following sample dissolves and completely in water? 4.65 x 10^25 formula units of strontium hydrogen carbonate. Enter your answer with one decimal place.

Solved • Mar 17, 2020

Mole Concept

Q. Calculate the number of hydrogen atoms in a 150.0 g sample of hydrazine (N2H4). Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.

Solved • Mar 5, 2020

Mole Concept

Q. A drop of water has a volume of approximately 7x10^-2 mL. How many water molecules does it contain? The density of water is 1.0 g/cm^3. Express your answer using one significant figure.

Solved • Feb 21, 2020

Mole Concept

Q. If you want to produce 1.00kg of aluminum, how much bauxite ore would you have to extract? (Assume that all of the bauxite ore mined from the ground is pure Al2O3)

Solved • Mar 3, 2020

Mole Concept

Q. Calculate the mass percent composition of nitrogen in each of the following nitrogen compounds. HNO3 Express your answer using four significant figures.

Solved • Feb 21, 2020