Answers edited by Taha Z.

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• A chemistry has 14.5 g of Al and 7.5 g of #O_2#. What would the excess be for the following reaction: #4Al + 3O_2 -> 2Al_2O_3#?
  
• How do you solve #\frac { x + 2} { 9} - \frac { 2x + 9} { 5} = 2x + 3#?
  
• If a #0.3*mol# quantity of calcium chloride is dissolved in a #1*L# water solvent what are the concentrations of #Ca^(2+)# and #Cl^-#?
  
• Question #0c929
  
• Question #94099
  
• Question #d56d7
  
• How do I differentiate #y=(tanx)^(x^2)# using natural logarithms?
  
• How do you evaluate #-3\geq \frac { S} { 23}#?
  
• How do you evaluate #\frac { 3x - 21} { 6x - 42}#?
  
• Question #64897
  
• Question #09738
  
• Question #249ab
  
• Express 563 in exponential notetion ?
  
• How do you solve #4( 9+ x ) = 136#?
  
• What is formal charge and how is it determined?
  
• An object travels North at #15 m/s# for #2 s# and then travels South at #2 m/s# for #8 s#. What are the object's average speed and velocity?
  
• How do you simplify #-[ 4- ( 5- x ) ]#?