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
Neporo4naja [7]
2 years ago
5

g 250. mL of a solution is created and has a molarity of 1.50 M. What is the molality of this solution if the volume and density

of the pure solvent is about the same as the volume and density of the final solution and the density of the pure solvent is 1.15 g/mL
Chemistry
1 answer:
nika2105 [10]2 years ago
8 0

Answer:

1.30 m

Explanation:

First we <u>calculate the number of moles of solute in the solution</u>, using the <em>definition of molarity</em>:

  • Molarity = moles / liters
  • Converting 250 mL ⇒ 250 / 1000 = 0.250 L
  • moles = 1.50 M * 0.250 L = 0.375 moles

Then we <u>calculate the mass of solvent</u>, using the <em>given volume and density</em>:

  • 1.15 g/mL * 250 mL = 287.5 g
  • Converting <em>287.5 g to kg</em> ⇒ 287.5 / 1000 = 0.2875 kg

Now we <u>calculate the molality of the solution</u>:

  • molality = moles of solute / kg of solvent = 0.375 mol / 0.2875 kg
  • molality = 1.30 m
You might be interested in
List or draw two ways to visually represent C6H14
KonstantinChe [14]
There are several ways to visually represent compounds. For this particular organic compound, we can use the skeletal formula and the expanded formula. The skeletal makes use of lines to show which atoms are bonded to each other. The expanded formula shows the species of the atoms and their bonding with other atoms. I have attached the two representations.

6 0
3 years ago
7.66 Write balanced equations for the following reactions: (a) potassium oxide with water, (b) diphosphorus trioxide with water,
White raven [17]

Explanation:

(a) potassium oxide with water

K_2O(s)+H_2O(l)\rightarrow 2KOH(aq)

According to reaction,1 mole of potassium  oxide reacts with 1 mole of water to give 1 mole of potassium hydroxide.

(b) diphosphorus trioxide with water

P_2O_3(s)+3H_2O(l)\rightarrow 2H_3PO_3(aq)

According to reaction,1 mole of diphosphorus trioxide reacts with 2 moles of water  to give 2 moles of phosphorus acid.

(c) chromium(III) oxide with dilute hydrochloric acid,

Cr_2O_3(s)+6HCl(aq)\rightarrow 2CrCl_3(aq)+3H_2O(l)

According to reaction,1 mole of chromium(III) oxide reacts with 6 moles of hydrochloric acid to give 2 moles of chromium(III) chloride and 3 moles of water.

(d) selenium dioxide with aqueous potassium hydroxide

SeO_2 (s)+2KOH (aq)\rightarrow K_2SeO_3(aq)+H_2O(l)

According to reaction,1 mole of selenium dioxide reacts with 2 moles of potassium hydroxide to give 1 mole of potassium selenite and 1 mole of water.

6 0
3 years ago
How many molecules are in 0.0740 mol NH3?
Mariana [72]

Number of molecules NH₃ = 4.45 x 10²²

<h3>Further explanation   </h3>

A mole is a number of particles(atoms, molecules, ions)  in a substance

This refers to the atomic total of the 12 gr C-12  which is equal to 6.02.10²³, so 1 mole = 6.02.10²³ particles  

Can be formulated :

N = n x No

N = number of particles

n = mol

No = 6.02.10²³ = Avogadro's number

mol of NH₃ = n = 0.074

So the number of molecules :

\tt N=n\times No\\\\N=0.0740\times 6.02\times 10^{23}\\\\N=4.45\times 10^{22}

3 0
2 years ago
From top to bottom in most groups of elements, atomic radii tend to A. decrease because the nuclear charge increases. B. decreas
Stels [109]
D. As more electrons are added to an element, the number of electron orbitals being filled increases
4 0
3 years ago
Read 2 more answers
What are the constituents of baking powder?
timurjin [86]
Baking powder is a mixture of baking soda and a mild edible acid such as tartaric acid
5 0
3 years ago
Other questions:
  • Write a chemical equation representing the first ionization energy for lithium. use e− as the symbol for an electron.
    12·2 answers
  • A temperature of 20 degrees C is equivalent to approximately
    5·2 answers
  • If it takes 43.2 mL of 0.1 M NaOH to neutralize a 50 mL HCl solution, how many moles of NaOH were added to the HCl solution?
    15·1 answer
  • 13. Which of the following has the highest amount of kinetic energy?
    13·1 answer
  • The prefix centi- means
    11·2 answers
  • A gas sample has a volume of 222 mL at 55.0 °C and 100.0 kPa pressure. Find the volume at
    8·1 answer
  • What is the charge for the polyatomic ions listed?<br> ammonium and acetate
    10·2 answers
  • Help me solve this equation for K please, will give brainliest
    5·1 answer
  • Argue whether this chemical reaction supports or does not support the Law of Conservation of Matter.
    10·1 answer
  • Write name of a plant having aquatic habitat​
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!