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
NARA [144]
3 years ago
8

1) Calculate the molarity of a solution produced by dissolving 35.7 g of solid Cu(ClO3)2 in enough water to make 250 mL of solut

ion.
2) How many moles of SnCO3 are in 317.4 mL of a 0.75M solution?
Chemistry
1 answer:
babymother [125]3 years ago
8 0

Answer:

1. 0.62M

2. 0.24mol

Explanation:

Molarity (M) = number of moles (n) ÷ volume (V)

1.) According to this question, 35.7 g of solid Cu(ClO3)2 was dissolved in water to make 250mL solution.

Molar mass of Cu(ClO3)2 where Cu = 63.5, Cl = 35.5, O = 16 is;

63.5 + {35.5 + 16(3)}2

63.5 + {35.5 + 48}2

63.5 + {83.5}2

63.5 + 167

= 230.5g/mol

Using mole = mass/molar mass

mole = 35.7/230.5

= 0.1548

= 0.155mol

Volume = 250mL = 250/1000 = 0.250L

Molarity = number of moles ÷ volume

Molarity = 0.155 ÷ 0.250

Molarity = 0.62M

2.) Molarity = number of moles ÷ volume

number of moles = Molarity × volume

Volume of SnCO3 solution = 317.4 mL = 317.4/1000 = 0.3174 L

number of moles (n) = 0.75M × 0.3174 L

n = 0.238

n = 0.24mol

You might be interested in
Pure chlorobenzene (C6H5Cl) has a normal boiling point of 131.00 °C. A solution of 32.5 g of 2,8-dibromodibenzofuran (C12H6Br2O)
vichka [17]

Answer:

Kb →  1.56 °C / m

Explanation:

This is all about boiling point elevation, the colligative property that shows that boiling point for a solution is higher than boiling point of pure solvent.

This is the formula: ΔT = Kb . m . i

where i is the Van't Hoff factor (ions dissolved in solution). As these are organic compounds, we assume they are non electrolytic,

m is molality (mol of solute / 1kg of solvent)

Kb is our unknown. The value for ebulloscopic constant, it is specific for each solvent.

ΔT = T° boiling from solution - T° boiling from solute

First of all, let's determine the moles of solute.

Mass / Molar mass → 32.5 g/ 113.45 g/mol = 0.286 mol

Molality is mol of solute/ 1 kg of solvent

We must convert the mass from g to kg

195g . 1kg /1000 = 0.195 kg

Molality = 0.286 mol / 0.195 kg = 1.47 m

Let's replace the values in the formula

133.30 °C - 131°C = Kb . 1.47m .1

2.30°C / 1.47 m =  Kb →  1.56 °C / m

3 0
3 years ago
What is the mass of a 4.259 g/cm3 substance which takes up 250.00 cm3 of space? answer in significan figures
marysya [2.9K]

Answer: that is wrong

Explanation:

4 0
4 years ago
Arrange these elements according to atomic Pb Si C Sn Ge
choli [55]
........C<Si<Ge<Sn<Pb
5 0
3 years ago
When a 3.25 g sample of solid sodium hydroxide was dissolved in a calorimeter in 100.0 g of water, the temperature rose from 23.
sertanlavr [38]

Answer : The enthalpy change for the solution is 42.8 kJ/mol

Explanation :

Heat released by the reaction = Heat absorbed by the calorimeter + Heat absorbed by the water

q=[q_1+q_2]

q=[c_1\times \Delta T+m\times c_2\times \Delta T]

where,

q = heat released by the reaction

q_1 = heat absorbed by the calorimeter

q_2 = heat absorbed by the water

c_1 = specific heat of calorimeter = 15.8J/^oC

c_2 = specific heat of water = 4.18J/g^oC

m = mass of water = 100.0 g

\Delta T = change in temperature = T_2-T_1=(32.0-23.9)=8.1^oC

Now put all the given values in the above formula, we get:

q=[(15.8J/^oC\times 8.1^oC)+(100.0g\times 4.18J/g^oC\times 8.1^oC)]

q=3513.8J=3.5138kJ        (1 kJ = 1000 J)

Now we have to calculate the enthalpy change for the solution.

\Delta H=\frac{q}{n}

where,

\Delta H = enthalpy change = ?

q = heat released = 3.5138 kJ

m = mass of NaOH = 3.25 g

Molar mass of NaOH = 40 g/mole

\text{Moles of }NaOH=\frac{\text{Mass of }NaOH}{\text{Molar mass of }NaOH}=\frac{3.25g}{40g/mole}=0.0812mole

Now,

\Delta H=\frac{3.5138kJ}{0.0821mole}=42.8kJ/mol

Therefore, the enthalpy change for the solution is 42.8 kJ/mol

4 0
3 years ago
A change in the nucleus of an atom that converts the atom from one element to another element is called
disa [49]
Combustion is the term used when something ignites
Neutralization is the term used when opposite pH acids and alkalis mix
Polymerization is the term used when monomers are chemically reacted to make polymers
Transmutation is the term used when an atom changes from one element to another
5 0
3 years ago
Read 2 more answers
Other questions:
  • Quincy wants to see a real example of rock weathering. Where would be the best place for him to go? A. up on the roof of his hou
    11·1 answer
  • When a person pushes off a wall with 15N of force,how much force does the wall push back
    6·1 answer
  • A scientist spilled a few drops of dilute hydrochloric acid (hcl) on a lab table. for safety purposes, the scientist sprinkled s
    11·1 answer
  • In the reaction of sodium and oxygen, which atom is the reducing agent?
    9·1 answer
  • Does the amount of matter change when the water goes from a solid to a liquid?
    13·1 answer
  • Which of the following may suggest a catalyst has been used in a reaction, given the energy diagram for the same reaction withou
    11·1 answer
  • When a solid is placed in a container and heat is applied, a phase change occurs. Watch the video and identify which of the foll
    10·2 answers
  • With carbon dioxide, what phase change takes place when the temperature
    13·1 answer
  • Minerals are part of the Geosphere, which is composed of several layers.<br> O True<br> O False
    13·2 answers
  • An inhibitor is added to an enzyme-catalyzed reaction at a concentration of 26.7 μM. The Vmax remains constant at 50.0 μM/s, but
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!