Answer:
0.4
Explanation:
Given parameters:
Mass of NaCl = 0.564g
Mass of KCl = 1.52g
Mass of LiCl = 0.857g
Unknown:
Mole fraction of KCl = ?
Solution:
First, find the number of moles of the given species;
Number of moles =
Molar mass of KCl = 39 + 35.5 = 74.5g/mol
Molar mass of NaCl = 23 + 35.5 = 58.5g/mol
Molar mass of LiCl = 7 + 35.5 = 42.5g/mol
Number of moles of KCl = = 0.02mol
Number of moles of NaCl = = 0.0096mol
Number of moles of LiCl = = 0.02mol
Sum of moles = 0.02mol + 0.0096mol + 0.02mol = 0.0496mol
Mole fraction of KCl = = 0.4
Options:
- NaOH(aq)
- NaOH(l)
- N2(g)
- NO(g)
Answer: <em>NaOH (aq)</em>
Explanation:
Defining state terminologies, '<em>aq' </em>means aqueous, meaning the analyte is in solution, as opposed to gaseous (g), or liquid (l).
CuFeS<span>2 chalcopyrite
M(</span>CuFeS<span>2)= 2*63.5+55.8+32*2= 246.8 kg/kmol
3710kg*1kmol/246.8 kg= 15.0 kmol </span>CuFeS2
in 15.0 kmol CuFeS2 is 15.0 kmol Cu
15.0 kmol Cu*63.5kg/1kmol=953 kg Cu
Fossils can not be formed in igneous rock because before it cooled from the liquid magma state, any renants of fossils would be destroyed and melted... they form in sedimentary because thats where they can be buried and perserved the easiest, metamorphic would destroy them from the pressures and temperatures involved in there formations
The absolute pressure inside the container is 286. 7 kPa.
The correct option is E.
<h3>What is absolute pressure?</h3>
Absolute pressure is a pressure that is measured in comparison to the zero pressure found in the universe's empty, airless space.
The ideal or absolute vacuum serves as the reference pressure.
Pabs is the abbreviation for "absolute".
The formula of absolute pressure is
P abs = P g + P atm
where Pabs is absolute pressure, Pg is gauge pressure, and Patm is atmospheric pressure.
Thus, the correct option is E, 286. 7 kPa.
Learn more about pressure, here:
brainly.com/question/356585