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Chem Notes Sep 6.docx

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San Diego State University
CHEM 100
Tom Huxford

Chem Notes Friday, September 6, 2013 1:04 PM What is the density of a mineral if 427 occupies 35.0 mL? 427g/35.0mL = 12.2 g/mL The density of gold is 19.3 g/mL. What is the mass of 25.0mL of gold? d=m/v Find the mass M=d*v 19.3x25.0=482.5~483 =4.83x10^2g *Specific Heat -sometimes called "heat capacity" Specific heat of a material is the amount of heat energy in joules, calories, btn, etc. Required to raise 1 gram of the material by 1C -Calculate the specific heat of a 125g solid if 1638J of heat raises the temp. of the solid from 25.0C to 52.6C. Cp=1638J/(125g)(27.6C)=0.474J/gC *Law of Conservation of Mass -Mass is neither created nor destroyed during a chemical reaction MASS OF REACTANTS=MASS OF PRODUCTS Na + Cl = NaCl 23.0g 35.4g 58.4g *Law of Conservation of Composition -Elements of a compound are present in a fixed and exact proportion by mass. -Water is ALWAYS 11.2% H and 88.87% by mass -Hydrogen Peroxide (H202) is ALWAYS 5.9% H and 94.17% by mass *Mass Percentage -Analysis of 7.800g of a compound yields 3.202g of Carbon, 1.725g of Hydrogen, and 2.842g of Nitrogen. Calculate the mass percentage of each element in the compound. -3.202gCarbon/7.8gCompound = 0.4105 (turn in
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