Textbook Question
Calculate the following quantities: (b) moles of Zn(NO3)2 in 143.50 g of this substance
Ch.3 - Chemical Reactions and Reaction Stoichiometry
Chapter 3, Problem 36a
Calculate the following quantities: (a) mass, in grams, of 1.50⨉10−2 mol CdS
Verified step by step guidance1
Identify the molar mass of CdS by adding the atomic masses of Cd (Cadmium) and S (Sulfur) from the periodic table.
The atomic mass of Cd is approximately 112.41 g/mol, and the atomic mass of S is approximately 32.07 g/mol.
Calculate the molar mass of CdS by adding the atomic masses: Molar mass of CdS = 112.41 g/mol + 32.07 g/mol.
Use the formula: mass = moles × molar mass to find the mass of CdS.
Substitute the given moles (1.50⨉10^{-2} mol) and the calculated molar mass of CdS into the formula to find the mass in grams.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Molar Mass
Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is calculated by summing the atomic masses of all the atoms in a molecule. For cadmium sulfide (CdS), the molar mass is determined by adding the molar mass of cadmium (Cd) and sulfur (S), which allows for the conversion between moles and grams.
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Stoichiometry
Stoichiometry is the area of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It allows chemists to calculate the amounts of substances involved in reactions based on their molar ratios. In this context, stoichiometry is essential for converting moles of CdS to grams using its molar mass.
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Unit Conversion
Unit conversion is the process of converting a quantity expressed in one set of units to another. In chemistry, this often involves converting moles to grams or vice versa. To find the mass of a substance from its amount in moles, one must multiply the number of moles by the substance's molar mass, ensuring that the units are consistent throughout the calculation.
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