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:
The molarity of the solution is 0.048 M (option B)
Explanation:
<u>Step 1: </u>Data given
Sucralfate has a molar mass of 2087 g/mole
mass = 1g
volume = 10 mL
<u>Step 2: </u> Calculate moles of sucralfate
Number of moles = mass of sucralfate / Molar mass of sucralfate
Number of moles = 1 g / 2087 g/mole = 4.79 * 10^-4 moles
<u>Step 3:</u> Calculate molarity
Molarity = Number of moles / volume
Molarity = (4.79 * 10^-4 moles) / (10 *10^-3 L)
Molarity = 0.0479 M ≈ 0.048 M
The molarity of the solution is 0.048 M (option B)
Answer: Mg3(PO4)2.
Explanation: remember phosphate nd phosphite are 2 different things.
phosphate= po4
phosphite= po3
