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
Kipish [7]
3 years ago
10

a sample of carbon dioxide is contained in a 250.0mL flask at 0.973 atm and 19.0 celcius. how many molecules of gas are in the s

ample​
Chemistry
2 answers:
klemol [59]3 years ago
7 0

Answer:

6.1133*10²¹ molecules of gas are in the sample​.

Explanation:

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

The pressure, P, the temperature, T, and the volume, V, of an ideal gas, are related by a simple formula called the ideal gas law:  

P*V = n*R*T

where P is the gas pressure, V is the volume that occupies, T is its temperature, R is the ideal gas constant, and n is the number of moles of the gas. The universal constant of ideal gases R has the same value for all gaseous substances. The numerical value of R will depend on the units in which the other properties are worked.

So to calculate the amount of gas molecules that are in the sample you must first calculate the amount of moles of the gas using the previous ideal gas law:

n=\frac{P*V}{R*T}

where:

  • P=0.973 atm
  • V=250 mL=0.250 L (1 L=1000 mL)
  • R=0.082057 \frac{atm*L}{mol*K}
  • T= 19 °C=292,15 °K (0°C=273.15°K)

Replacing:

n=\frac{0.973 atm*0.250 L}{0.082057\frac{atm*L}{mol*K}*292.15K }

Resolving:

n≅0.01015 mol

On the other hand, the Avogadro Number or Avogadro Constant is called the number of particles that constitute a substance (usually atoms or molecules) and that can be found in the amount of one mole of that substance. Its value is 6.023 * 10²³ particles per mole.

Then, applying rule of three it is possible to calculate the amount of molecules present in the sample: if in one mole there are 6.023*10²³ molecules, in 0.01015 moles how many molecules will there be?

number of molecules=\frac{0.01015 moles*6.023*10^{23}molecules }{1 mol}

number of molecules≅6.1133*10²¹

<u><em>6.1133*10²¹ molecules of gas are in the sample​.</em></u>

lbvjy [14]3 years ago
3 0

Answer:n = PV/RT = 0.923 atm x 0.250 L / (0.082057 x 290.75 K) . n = 0.00967. mole  0.00967 mole x 6.22x10^23 molecules/mole = 6.02x10^21 molecules of gas

Explanation:

You might be interested in
If a reaction has an equilibrium constant slightly greater than 1, what type of reaction is it?
Paha777 [63]
Reversible, flavoring products
4 0
3 years ago
Read 2 more answers
Two unknown molecular compounds were being studied. A solution containing 5.00 g of compound A in 100. g of water froze at a low
LenaWriter [7]

Answer:

Compound B has greater molar mass.

Explanation:

The depression in freezing point is given by ;

\Delta T_f=i\times k_f\times m..[1]

m=\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Mass of solvent in kg}}

Where:

i = van't Hoff factor

k_f = Molal depression constant

m = molality of the solution

According to question , solution with 5.00 g of A in 100.0 grams of water froze at at lower temperature than solution with 5.00 g of B in 100.0 grams of water.

The depression in freezing point of solution with A solute: \Delta T_{f,A}

Molar mass of A = M_A

The depression in freezing point of solution with B solute: \Delta T_{f,B}

Molar mass of B = M_B

\Delta T_{f,A}>\Delta T_{f,B}

As we can see in [1] , that depression in freezing point is inversely related to molar mass of the solute.

\Delta T_f\propto \frac{1}{\text{Molar mass of solute}}

M_A

This means compound B has greater molar mass than compound A,

4 0
3 years ago
Calculate the [OH-]<br> [H+]=0.000025
Harman [31]

Explanation:

There are several ways to define acids and bases, but pH and pOH refer to hydrogen ion concentration and hydroxide ion concentration, respectively. The "p" in pH and pOH stands for "negative logarithm of" and is used to make it easier to work with extremely large or small values. pH and pOH are only meaningful when applied to aqueous (water-based) solutions. When water dissociates it yields a hydrogen ion and a hydroxide.

3 0
3 years ago
When hydrogen peroxide (H2O2) is added to potassium iodide (KI) solution, the hydrogen peroxide decomposes into water (H2O) and
riadik2000 [5.3K]

Answer:

D. Catalyst

Explanation:

Because a Catalyst is a substance that causes or accelerates a chemical reaction without itself being affected.

5 0
3 years ago
How many atoms are in the 3.5 moles of arsenic atoms?
Dmitry_Shevchenko [17]
Number of atom in one mole = 6.022 × 10²³
So, in 3.5 moles, it would be: = 6.022 × 10²³ * 3.5 = 2.1 × 10²⁴

In short, Your Answer would be 2.1 × 10²⁴ atoms

Hope this helps!
6 0
3 years ago
Read 2 more answers
Other questions:
  • Consider the following reversible reaction.
    9·1 answer
  • Isotopes of the same element have the same chemical properties because they have the same number of
    11·1 answer
  • How many milliliters of a 1.25 molar hydrochloric acid (HCl) solution would be needed to react completely with 60.0 grams of cal
    14·1 answer
  • What is the molality of a solution
    9·1 answer
  • Decribe the difference between and climate.
    14·1 answer
  • Iron(II) can be oxidized by an acidic K2Cr2O7 solution according to the net ionic equation: Cr2O72− + 6Fe2+ + 14H+ → 2Cr3+ + 6Fe
    12·1 answer
  • Describe the effects of temperature and pressure on solubility. If you had used boiling water instead of lukewarm water, would y
    15·1 answer
  • A person lying out in the sun to get a tan is an example of conduction, convection, or radiation.
    14·2 answers
  • Look for hazard symbols on products currently being used in your home. Name five with the corresponding symbol. You may not repe
    5·1 answer
  • Hydrogen and iodine gas react to form hydrogen iodide, as shown in the equation H2(g) + I2(g) → 2HI(g). Suppose you are given a
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!