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63 solutions

Mass Percent

Q. A mixture of CaCo3 and (NH4)2CO3 is 61.9% CO3 by mass. Find the mass percent of CaCO3 in the mixture. (Where does the 96g of (NH4)2CO3 come from)

Solved • Nov 10, 2019

Mass Percent

Q. Calculate the mass/volume percent of a NaCl solution in which 160 g of NaCl is dissolved in enough water to give a total volume of 2.44 L. Express your answer numerically.

Solved • Nov 7, 2019

Mass Percent

Q. A 4.853 g sample containing Zn2+ is dissolved and treated with excess (NH4)2HPO4 , resulting in the formation of the precipitate ZnNH4PO4⋅H2O . The precipitate is filtered, washed, dried, and then ignited to convert the precipitate to Zn2P2O7 . The mass of Zn2P2O7 collected was 0.948 g. Calculate the weight percent of Zn2+ in the original sample.

Solved • Oct 22, 2019

Mass Percent

Q. After 2.325g of BaCl2 hydrate is dried, its new mass is measured to be 1.982g. Compute the mass percent of the hydrate. Determine the hydrate number for BaCl2

Solved • Oct 16, 2019

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