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Sergio [31]
2 years ago
6

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

e vapor pressure of pure water at this temperature is 31.8 torrtorr. Assume that glycerin is not volatile and dissolves molecularly (i.e., it is not ionic) and use a density of 1.00 g/mLg/mL for the water.
Chemistry
1 answer:
alexgriva [62]2 years ago
6 0

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

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You have 100 g of Pb(NO3)2. How many moles is this?​
topjm [15]

Answer:

0.302 moles

Explanation:

Data given

Mass of Pb(NO₃)₂ = 100 g

Moles of Pb(NO₃)₂ = ?

Solution:

To find mole we have to know about molar mass of Pb(NO₃)₂  

So,

Molar mass of Pb(NO₃)₂  = 207 + 2[14 + 3(16)]

                                           = 207 + 2[14 + 48]

                                           = 207 + 124

Molar mass of Pb(NO₃)₂  = 331 g/mol

Formula used :

                no. of moles = mass in grams / molar mass

Put values in above formula

                   no. of moles = 100 g / 331 g/mol

                   no. of moles = 0.302 moles

no. of moles of  Pb(NO₃)₂ = 0.302 moles

7 0
3 years ago
Co(g) effuses at a rate that is ______ times that of cl2(g) under the same conditions.
il63 [147K]

Answer is: the ratio of the effusion rate is 1.59 : 1.

1) rate of effusion of carbon monoxide gas = 1/√M(CO).  

rate of effusion of carbon monoxide gas = 1/√28.

rate of effusion of carbon monoxide gas = 0.189.  

2) rate of effusion of chlorine = 1/√M(Cl₂).  

rate of effusion of chlorine = 1/√70.9.  

rate of effusion of chlorine = 0.119.  

rate of effusion of carbon monoxide : rate of effusion of chlorine =

= 0.189 : 0.119 / ÷0.119.

rate of effusion of carbon monoxide : rate of effusion of chlorine = 1.59 : 1.

4 0
2 years ago
What kinds of scientific investigations involve making observations?
rodikova [14]
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Based on this theory, a knowledge considered to be true if the knowledge kehoren with the knowledge that exists and has been proven to be true. In the study of mathematics this is usually called the deductive nature.

2. Correspondence Theory (Theory of corespondence)

Based on this theory, a knowledge considered to be true if the knowledge of having a relationship with a reality that is true. This theory is based on the empirical fact that knowledge is true if there are facts that support that is true knowledge. Thus the truth here is based on inductive inference.

3. Pragmatic Theory (Theory of Pragmatism)

According to this theory, knowledge is said to be true if the knowledge is seen practically completely or have properties that true practicality. Followers of this theory argue that knowledge is true if it has keguanaan practical<span>.</span></span>
5 0
3 years ago
How many valence electrons does a neutral atom of beryllium have
andrezito [222]

Answer:

A neutral Beryllium atom has two (2) valence electrons

Explanation:

<em>Beryllium, Be,</em> is a group 2 element on the periodic table. Its atomic number is 4.

Generally, atomic number equals number of electrons, which means a neutral Beryllium atom contains four (4) electrons: two (2)  in the inner shells and 2 in the outer shell (valence electrons), which can take part in a chemical reaction and participate in chemical bonding.

8 0
3 years ago
What is the coefficient for titanium tetrachloride when the equation below is balanced?
amm1812

Answer:

I believe that it is B. 1

Explanation: I could be wrong but I believe its 1

7 0
2 years ago
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