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Mass Percent

Q. Three compounds, silver oxide, ammonium hydroxide, and ammonium nitrate react to form a complex silver compound and water. The silver complex is found to contain 52.89% Ag, 20.61% N, 2.97% H, and 23.53% O. Calculate the mass of each reactant needed to produce 45.35 g of the complex silver compound.

Solved • Oct 14, 2019

Mass Percent

Q. Vitamin B12, cyanocobalamin, is essential for human nutrition. It is concentrated in animal tissue but not in higher plants. Although nutritional requirements for the vitamin are quite low, people who abstain completely from animal products may develop a deficiency anemia. Cyanocobalamin is the form used in vitamin supplements. It contains 6.54% hydrogen by mass. Calculate the molar mass of cyanocobalamin, assuming that there are eighty-eight atoms of hydrogen in every molecule of cyanocobalamin

Solved • Oct 14, 2019

Mass Percent

Q. The precipitate you have formed is MgNH4PO4.6H2O. The mass of the MgNH4PO4.6H2O precipitate is 10.854g. The mass of the plant food is 5.262g. The available P2O5 is 30%. A) Calculate its formula weight B) From this formula and the mass of the precipitate you obtained, calculate the number of grams of phosphorus, P in the plant food.t) C) From the number of grams of phosphorus, calculate the number of grams of P2O5 in the plant food. D) Calculate the % P2O5 in the plant food. How does your value compare with the value listed on the plant food label?

Solved • Oct 10, 2019

Mass Percent

Q. Determine the percent composition of potassium dichromate, K2Cr2O7.

Solved • Oct 10, 2019

Mass Percent

Q. An aqueous solution of H2O2 has a concentration of 9.79M. Calculate the percent by mass of H2O2 in the solution. (density of the H2O2 solution is 1.11g/mL)

Solved • Oct 10, 2019

Mass Percent

Q. If 1.4% of the mass of a human body is calcium, how many kilograms of calcium are there in a 185-pound man? a) 5.7kg Ca b) 1.2*10^2kg Ca c) 1.2kg Ca d) 5.7*10^2kg

Solved • Oct 5, 2019

Mass Percent

Q. A solution of ethanol, CH3CH2OH, in water has a concentration of 1.10 m. Calculate the mass percent of ethanol.

Solved • Sep 26, 2019