2.55 grams of KClO3 are dissolved in 25.2 grams of water.  The solution has a final volume of 27.3 ml. 
The molar mass of KClO3 is 122.55 g/mol. 
 
Calculate the concentration of KClO3 in the solution by the following two methods:
1) percent by mass:  
2) molarity: 
 
Round answers to the 100th's place and include units. 
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The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true

Aperfume bottle is dropped in the corner of a room. the odor of the perfume can be detected on the other side of the room. which statement best describes this observation?

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397