Answer:
29.256 torr.
Explanation:
Number of moles
Glycerin:
Molecular weight of glycerin = (12*3) + (1*8) + (16*3)
= 36 + 8 + 48
= 92 g/mol
Number of moles = mass/molar mass
= 25.2/92
= 0.274 mol
Water:
Converting g/ml to g/l,
1000 ml = 1 l
= 1 g/ml * 1000 ml/1l
= 1000 g/l
Mass = (density * volume)
= 1000*0.124
= 124 g.
Molar mass of water = (1*2) + 16
= 18 g/mol
Number of moles = mass /molar mass
= 126/18
= 6.89 mol
P°solution = xsolvent * P°solvent
Where,
xwater = xsolvent = mole fraction of water.
Mole fraction is defined as the number of moles of a component of a solution divided by the total number of moles present in that solution.
xwater = mole of water/total mole of solution
Total mole = 6.89 + 0.274
= 7.164 moles
xwater = 6.89/7.164
= 0.962
P°solution = xsolvent * P°solvent
P°solution = 31.8 * 0.962
= 29.256 torr
Answer:
A fluorine atom has nine protons and nine electrons, so it is electrically neutral. If a fluorine atom gains an electron, it becomes a fluoride ion with an electric charge of -1.
Answer : (C) "Higher frequencies have larger spaces between lines".
Explanation:
In Young's experiment, the condition for constructive interference is given by :
.........(1)
n is order or number of lines observed
d is distance between slits
is the angle between the path and the line from screen to the slits.
We also know that, 
or
where,
c is the speed of light
is frequency
is wavelength
So, equation (1) turns into
So,
or
Higher frequencies have larger spaces between line.
So, correct option is (C).
Answer: 5
Explanation: add up all the electrons and it will amount to 23. Arranging by the old model for electronic configuration, we have : 2, 8, 8, 5
The last number being 5 represent its valence electron
Answer:
C. is the answer i did the test and it was right.
