Answers edited by Edmund Liew

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• How many grams of #O_2# are in 5.0 mol of the element?
  
• What is the standard form of #y= (x+7)(x-8)^2 #?
  
• How many molecules are present in 1296 g of dinitrogen pentoxide #N_2O_5#?
  
• Question #85ee6
  
• Question #8b7ec
  
• What is the name of #AlCl_3#?
  
• What is the molecular formula of a compound if its empirical formula is #CFBrO# and its molar mass is 381.01 g/mol?
  
• How many moles of oxygen gas will be formed from 6.45 g of potassium chlorate?
  
• What is percent composition of ethanol ( #C_2H_5OH# )?