1. What percentage of the solution is formed from 80g HCl and 230g water?

2. What is the volume of a solution with a substance concentration of 1 M
(1 mol / dm3) can be prepared from 156 g KOH?

3. How many grams of 9% HCl need to be added to 340g of 50%
solution of the same acid to form a 25% solution?

Problem page combustion of hydrocarbons such as pentane ( c5 h12 ) produces carbon dioxide, a "greenhouse gas." greenhouse gases in the earth's atmosphere can trap the sun's heat, raising the average temperature of the earth. for this reason there has been a great deal of international discussion about whether to regulate the production of carbon dioxide.(a) write a balanced chemical equation, including physical state symbols, for the combustion of liquid pentane into gaseous carbon dioxide and gaseous water. (b) suppose 0.350 kg of pentane are burned in air at a pressure of exactly 1 atm and a temperature of 20.0 degree c. calculate the volume of carbon dioxide gas that is produced.be sure your answer has the correct number of significant digits.