To determine the number of grams of potassium hydroxide, we need to know what is the units of parts per million and what it means. Then, we can multiply the grams of solution to obtain the grams KOH. Parts per million (ppm) means that there is 1 mass unit of solute per 1 million mass units of solution. Therefore,
300 ppm = 300 g KOH / 1000000 g solution
mass KOH = 300 g KOH / 1000000 g solution (1000 g solution)
mass KOH = 0.3 g KOH
Answer: Option (d) is the correct answer.
Explanation:
According to the given situation, mass of compound will be calculated as follows.
Mass of compound = mass of flask and condensed vapor - mass of flask
= 115.23 - 114.85
= 0.38 g
Volume (V) = 255 mL = 
(as 1 ml = 
)
Pressure (P) = 101325 Pa
Temperature = 
= (100 + 273) K = 373 K
Now, according to the ideal gas equation, PV = nRT
and, moles of compound n = 
= 
= 0.008332 mol
As, molar mass of compound = 
= 
= 46 g/mol
Therefore, the compound is 
(molar mass = 12 x 2 + 5 x 1 + 16 + 1 = 46 g/mol).
Thus, we can conclude that out of the given options the liquid could be .
Answer:
Ex1 = 4.3 moles
Explanation:
for Ex 1
** Number of mole = Mass (g) / Molecular weight ' Mw' (g/mole)
for a = NaCl , first you must be calculate Mw = look to periodic table
Atomic weight for Na is 22.9 = 23 g and for Cl is 35.45 = 35 g
so Mw for NaCl = 23+35 = 58 g/mole
so Number of Moles for NaCl 250 g is
Number of Moles = 250 / 58 = 4.3 moles
do same for others ...
good luck ..
Answer: False
Explanation: Electrolyte are good conductors of electricity because they contain ions which are able to move about
