CHEM 1021 Lecture Notes - Lecture 20: Horse Length, Specific Volume, Nonmetal
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Mass solution = mass solute + mass solvent. Use the same mass units for all masses. Mass percent has no units or in grams. Mass percent naoh = 8. 00 g / 58. 00 g x 100 = 13. 8% naoh. 1 g of solute in 100 g of solution. Mass percent is commonly used in commercial solutions. Physiological saline solutions used in intravenous injections have a concentration of 0. 90% sodium chloride by mas. How many grams of sodium chloride are needed to prepare 500. g of solution. Second wat to try: conversion factor - dimensional analysis approach (500. g solution)(0. 0090 g nacl/1 g solution) = 4. 5 g nacl. 1. 00 mol naoh | {(1 l solution)/(0. 2 mol naoh)} = 5 l. It is estimated that the concentration of gold in sea water is 2. 03 x 10^-11 (mol/l). | 1 l | 1 mol au | The amount of solvent changes (more is added) The amount of solute is staying the same.
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