1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Rama09 [41]
3 years ago
15

25 g of a compound is added to 500 mL of water if the freezing point of the resulting solution is

Chemistry
1 answer:
vlabodo [156]3 years ago
5 0

Answer:

a)   119 g/mol

Explanation:

-We apply the formula for freezing point depression to obtain the molality of the solution:

\bigtriangleup T_f=K_fm, \  \ K_f=1.36\textdegree C/m\\\\\therefore m=\frac{\bigtriangleup T_f}{K_f}\\\\=\frac{0.57\textdegree C}{1.36\textdegree C}\\\\=0.4191\ mol/Kg\\\\

#We use the molality above to calculate the molar mass:

m=\frac{0.4191\ mol}{1\ Kg}=\frac{25\ g}{0.5\ Kg}\\\\\therefore 1 \ mol=\frac{25\ g}{0.5\ Kg}\times\frac{1\ Kg}{ 0.4191}\\\\=119.3033\approx 119\ g/mol

Hence, the molar mass of the compound is 119 g/mol

You might be interested in
A ________ reaction occurs when one compound reacts and is broken down into different elements or simpler compounds?
faust18 [17]

Answer: decomposition

Explanation:

1 . Combustion is a type of chemical reaction in which a hydrocarbon reacts with oxygen to form carbon dioxide ans water along with liberation of large amount of energy.

2. Decomposition is a type of chemical reaction in which a single reactant gives two or more than two products.

CaCO_3\rightarrow CaO+CO_2

3. Single replacement is a type of chemical reaction in which a more reactive element displaces the less reactive element from its slat solution.

4. Synthesis is a type of chemical reaction in which two or more than two reactants combine together to give a single product.

5 0
3 years ago
Read 2 more answers
A decrease in the magnitude of velocity is called
IceJOKER [234]
<span>The answer is deceleration. Acceleration is the general term to refer to the change in velocity. Acceleration = change in velocity / change in time. When you want to highlight the fact that the change in velocity is a decrease in the magnitude, you can use the term deceleration, which means that the acceleration is negative.</span>
3 0
3 years ago
The proper name for a carbohydrate polymer with 2 subunits is
valentina_108 [34]
Carbohydrates are classified in three major categories depending upon the number of sub units joining to form them. These are,

                                                Monosaccharides

                                                Oligosaccharides

                                                Polysachharides

The simplest single units are monosaccharides, if units are ranging between two and twenty they are called oligosaccharides and above twenty joining units they are called polysachharides.

Result:
          <span>The proper name for a carbohydrate polymer with 2 subunits is called Oligosachharide in general and Disaccharide in specific.</span>
8 0
3 years ago
Which matter exists in the gaseous state at room temperature?
Tpy6a [65]
Helium i would think so
3 0
3 years ago
Read 2 more answers
FeS2 + 5 O2 2Fe2 + 4SO2 How many moles of FeO are formed from 0.57 moles of O2?
bagirrra123 [75]

Answer:

0.228 mol FeO

Explanation:

                                 2FeS2 + 5 O2----> 2FeO + 4SO2

from reaction                           5 mol       2 mol

given                                       0.57 mol    x

x = 0.57*2/5 = 0.228 mol FeO

3 0
3 years ago
Other questions:
  • How do you find concentration from absorbance mg and ml?
    5·1 answer
  • Is cyclohexanol an alkane, alkene, or an alcohol?
    5·1 answer
  • Mendeleev put elements in groups while creating the periodic table. What important role do groups play in the structure of the p
    11·1 answer
  • Heterotrophic bacteria obtain food by
    5·1 answer
  • A helium balloon with an internal pressure of 1atm and a volume of 4.20 L at 18.0°C is released. What volume will the balloon oc
    10·1 answer
  • What is an example of reactivity?
    5·1 answer
  • What happens to the DNA during interphase?
    5·2 answers
  • 20. A compound's empirical formula is C5H5O If the molecular mass of the compound is
    11·1 answer
  • In diamond, each carbon atom is covalently bonded to four other carbons in a
    9·1 answer
  • What is true about the position of any metal in the periodic table
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!