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
avanturin [10]
3 years ago
14

aqueous solution containing 17.5 g of an unknown nonelectrolyte compound in 100. gof water has a freezing point of –1.8 oC. Calc

ulate the molar mass of the unknown compound. Kffor water = 1.86 °C/m
Chemistry
2 answers:
Semenov [28]3 years ago
7 0

Answer:

The molar mass of the nonelektrolyte is 180.8 g/mol

Explanation:

Step 1: Data given

Mass of non-elektrolyte = 17.5 grams

MAss of water = 100 grams = 0.1 kg

Freezing point of solution = -1.8 °C

Kf water = 1.86 °C/m

Step 2: Calculate molality

ΔT = i*kf*m

⇒ with ΔT = the freezing point depression = 1.8 °C

⇒ with i = the van't Hoff factor = 1

⇒ with kf = the freezing point depression constant = 1.86 °C/m

⇒ with m = molality

1.8 = 1* 1.86 * m

m =1.8 / 1.86

m = 0.9677 molal

Step 3: Calculate moles nonelectrolyte

molality = moles nonelectrolyte / mass water

0.9677 molal = moles / 0.1 kg

moles = 0.9677 molal * 0.1 kg

moles = 0.09677 moles

Step 4: calculate molar mass of the nonelectrolyte

Molar mass = mass / moles

Molar mass = 17.5 grams / 0.09677 moles

Molar mass = 180.8 g/mol

The molar mass of the nonelektrolyte is 180.8 g/mol

miskamm [114]3 years ago
4 0

Answer:

The molar mass for the solute is 180.8 g/mol

Explanation:

We apply the colligative property of freezing point depression.

The formula is T° freezing pure solvent - T° freezing solution = Kf . m

T° freezing pure solvent - T° freezing solution → ΔT

Kf = 1.86 °C/m

m is molality. We must determine with data given.

Molality are the moles of solute contained in 1 kg of solvent

0° - (-1.8°C) = 1.86 °C/m . m

1.8°C / 1.86 m/°C = m → 0.968 mol/kg

We multiply the molality by kg of solute, to determine the moles

100 g . 1kg/1000 g = 0.1kg → 0.968 mol/kg . 0.1 kg = 0.0968 moles

To find the molar mass we make g/ mol → 17.5 g / 0.0968 mol =

180.8 g/mol

You might be interested in
Which is unique to the tire of the car
kvasek [131]

it is c trench marks

7 0
3 years ago
Read 2 more answers
what is a major drawback of using fossil fuels they warmn the planet they contain no greenohuse gases
Charra [1.4K]

The major drawback of fossil fuels is that they warm the planet i.e. they cause global warming.

The reaction typically gives off heat and light as well. The general equation for a complete combustion reaction is:

                                  Fuel + O2 → CO2 + H2O + ENERGY

<h3>Disadvantages of Fossil fuels</h3>

The term "fossil fuels" refers to flammable organic geologic formations, including dead organic matter that has been buried hundreds of feet beneath sediment.

  • Fossil fuel emissions include various oxides, such as carbon, nitrogen, and sulfate, which cause acid rain and harm the soil's fertility and water quality.
  • Both coal and petroleum burning discharge a significant amount of pollutants into the atmosphere, contributing to pollution levels.
  • Gases like carbon dioxide are released through the burning of fossil fuels, which aids in climate change.

To view similar questions on Fossil fuels, refer to:

brainly.com/question/14339391

#SPJ4

7 0
10 months ago
Most reactive<br> O Be<br> O Mg<br> O Ba<br> o Ca<br> Which one is the most reactive
katen-ka-za [31]

Answer:

Mg

Explanation:

I think the answer is Mg

7 0
3 years ago
In a salt solution, what happens to sodium and chloride ions?
iVinArrow [24]
<span>In a salt solution (a solution of water (H2O) and Salt, chemical formula NaCl), the positively charged Hydrogen atoms from water form bonds with the negatively charged Chloride atoms of Salt (which is the formulate NaCl), and the negatively charged oxygen atom of water (one atom per water molecule) form a bond with the positively charged Sodium ions (Na) of salt.</span>
4 0
3 years ago
What process removes carbon dioxide from the ocean?
Katen [24]

Answer:

B. decay of dead marine organisms

Explanation:

When the temperature is low, carbon dioxide is captured by the oceans, and when the temperature is high, it is released by the oceans into the atmosphere. At sea, carbon dioxide feeds phytoplankton.

Most of the carbon dioxide consumed by plant plankton (phytoplankton) returns to the atmosphere when this phytoplankton dies or is consumed, but a portion is deposited in the ocean floor sediments when these small particles sink. This process is called a "biological bomb" because carbon dioxide is transported from the atmosphere to the ocean floor.

8 0
3 years ago
Other questions:
  • What volume of a 6.0m hcl solution is required to make 250.0 milliters of 1.5 m hcl
    13·1 answer
  • How many lead atoms are in a cube of lead that has a volume of 2.18 cm3 if the density of lead is 11.3 g/cm3?
    14·1 answer
  • Zinc is used as a coating for steel to protect the steel from environmental corrosion. If a piece of steel is submerged in an el
    5·1 answer
  • Name the functional group in the following molecule:<br><br> H-C(Triple Bond)C-CH2CH3
    15·1 answer
  • Zinc reacts with hydrochloric acid to produce zinc chloride and hydrogen. How many grams of HCl are required to produce 1,023 g
    15·1 answer
  • What is generally true about the compressibility of solids?
    7·2 answers
  • Iron(III) oxide and hydrogen react to form iron and water, like this:
    9·1 answer
  • What is the answer to-6 + 1 = -5/
    7·1 answer
  • If your sweat glands suddenly got clogged or blocked, what function of the Integumentary system might not work anymore?
    14·1 answer
  • How much heat (in kJ k J ) is evolved in converting 2.00 mol m o l of steam at 135 ∘C ∘ C to ice at -42 ∘C ∘ C ? The heat capaci
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!