CHEM 1040 Lecture Notes - Lecture 15: Limiting Reagent, Barium Chloride, Novella

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Chem 1040 lecture 15 types of stoichiometry questions. This is not a finite list, but we will cover some of the types of stoichiometry questions you will encounter. Given the mass, volume, temperature, and pressure of a gas, use the ideal gas law to find its molar mass. Ex: a 250mg sample of hydroquinone has a volume of 92. 3ml at 210 c and a pressure of. First, use the ideal gas relationships to find the number of moles of hydroquinone in the sample. Remember to use appropriate units! n=pv/rt n=(98. 9kpa)(0. 0923l)/(483. 15)(8. 31kpalk-1mol-1) n=2. 2736e-3. Now, find the molar mass using the formula m=m/n. Finding the number of atoms in a sample. Given the mass and molar mass of species, find the number of atoms/molecules in the sample. Ex: iron is present in red blood cells. On average there are 2. 90g fe for 2. 60e13 red blood cells. What is the average number of fe atoms in each blood cell.

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