Answer:
The retention factor, k is 2.49
Explanation:
According to the theory of High-Performance Liquid Chromatography (HPLC), the retention factor (or capacity), k, of a column is the ratio of the retention time of a retained analyte (toluene) to that of the un-retained solute (methane).
This implies that:
k = 
= 
retention factor, k = 2.49.
Note that there is no unit for retention factor, as it is a ratio.
Answer:.1 kJ = 1000 J and 1J=0.24cal
----->78.9kJ=1000x78.9x0.24=18936cal
Explanation:
This is the unit regulated by the scientific community and they follow the formula that they prove
In this question, every time you rinse the flask, 1 ml of the solution will adhere and you add it with 9ml which will result as 10ml(1ml + 9ml). So, every time you rinse the flask it concentration will drop to 1/10 times of before. If the solution initial concentration is 0.9m, then the amount needed to rinse is:
Final concentration <= initial concentration * (1/10) ^ rinse
0.0001m<= 0.9m * 1/10^rinse
0.001m/ 0.9m<= 1/ 10^ rinse
0.11 * 10^-3 <=1* 10 ^ - rinse
rinse= 3
it needs at least 3x rinse to get the concentration into <<span>0.0001 m</span>
