I need help with level 15 in covalent bonding in playmada collisions app.

Calculate the vapor pressure of a solution containing 25.2 gg of glycerin (C3H8O3)(C3H8O3) in 124 mLmL of water at 30.0 ∘C∘C. Th

alexgriva [62]

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

6 0

3 years ago

How many weeks does it take for one full moon to go to the next full moon

OlgaM077 [116]

4 weeks for the moon to go to the next full moon

8 0

3 years ago

Read 2 more answers

The length breadth and thickness of a brick is 18cm 8 cm and 5cm respictively find the area of the widest part of rhe brick

Sunny_sXe [5.5K]

Answer:

144cm²

Explanation:

Given dimensions:

Length x breadth x thickness

18cm x 8cm x 5cm

The widest part of this figure will be the face containing the length and the breadth.

The breadth is the width of the figure;

Area of the widest part = length x breadth = 18cm x 8cm = 144cm

The area of the widest part of the figure is 144cm²

4 0

3 years ago

Round off each number to the indicated number significant figures (sf):

qaws [65]

Answer :

(a) The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number in 3 significant figures will be, $2.24\times 10^1$

Explanation :

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

(a) The given number 00003554 converted into 2 significant figures.

In 00003554, there are 4 significant figures. Now we have to convert it into 2 significant figures.

The given number in 2 significant figures will be, $3.6\times 10^3$

(b) The given number 35.8348 converted into 4 significant figures.

In 35.8348, there are 6 significant figures. Now we have to convert it into 4 significant figures.

The given number in 4 significant figures will be, $3.583\times 10^1$

(c) The given number 22.4555 converted into 3 significant figures.

In 22.4555, there are 6 significant figures. Now we have to convert it into 3 significant figures.

The given number in 3 significant figures will be, $2.24\times 10^1$

7 0

3 years ago

Wear _______________________ when handling batteries, because they can explode or leak.

Basile [38]

The answer is: b. Safety glasses and acid-resistant gloves.

Battery acid (sulfuric acid) has pH = 0.

Sulfuric acid (H₂SO₄) is a strong acid, it means that the solution of sufuric acid is more acidic (pH<7) than water (pH = 7).

Chemical dissociation of sulfuric acid in water:

H₂SO₄(aq) → 2H⁺(aq) + SO₄²⁻(aq).

Sulfuric acid can come in contact with eyes and hands, so it is important to wear safety glasses and acid-resistant gloves.

4 0

3 years ago