CHEM 100 Chapter Notes -Scientific Notation, Atomic Mass, Hydrogen Peroxide
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What is the mass of 25. 0ml of gold? d=m/v. 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. Mass is neither created nor destroyed during a chemical reaction. 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. 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 into a percentage) = 41. 05% carbon. 1. 7256g hydrogen/7. 8gcompound = . 2252% = 0. 2251 = 22. 51% All matter is ultimately composed of very small particles called atoms
