chem
Calculate the number of moles of solute present in each of the following solutions. a) 39.0 mg of an aqueous solution that is 1.00 m NaCl b)90.0 g of an aqueous solution that is 2.10% sucrose (C12H22O11) by mass.
Math
John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?
Percents Using Proportions
Thank you! I will reverse my work now. This was extremely helpful for grasping a new concept.
Percents Using Proportions
Here is my (probably incorrect) work so far: 1) n/160 = 125/100 40 160x125=4000 ________ 100 | 4000 Was I suppose to divide it or not? I'm not sure. 2) 714/1295 = n/100 _________ 714/1295=102/185 185 | 10,200 102x100=10,200
Percents Using Proportions
I do not understand the wording and/or got stuck while I was working on the following two problems: The attendance at a family reunion was 160 people. This was 125% of last year's attendance. How many people attended the reunion last year? There are 1,295 students attendin...
science-repost! please help
Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this
science
The enthalpy of solution of KBr in water is about +198 kJ/mol. Nevertheless, the solubility of KBr in water is relatively high. Why does the solution process occur even though it is endothermic
chem
Determine if the following substances are soluble (at room temperature, 1 atm) in water or in hexane (: grease and CS2 how do you know this
chem-
Draw the structures of the two monomers that yield Nomex®. can someone show me?
Pre-Algebra
Simplify the expression. Write the result using positive exponents only. (-2x^3y^-4)(5x^-1y)
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