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
Leokris [45]
3 years ago
7

4. How many moles in 2.0 x 1023 atoms of H2O? here.

Chemistry
1 answer:
mezya [45]3 years ago
8 0

Answer:

0.33 moles

Explanation:

to find the number of moles,

moles = number of atoms / avogadro's number ie 6.02 x 10^{23}

moles = 2.0 x 10^{23} / 6.02 x 10^{23}

moles = 0.33 mol

You might be interested in
Help please<br> Protein produced from mutated strand?<br><br> And effect of mutation??
SIZIF [17.4K]
Is that a test? I can’t help if it is
7 0
3 years ago
What is the boiling point elevation constant, Kb, of diethyl ether if 38.2 g of the nonelectrolyte benzophenone, C6H5COC6H5, dis
kakasveta [241]

Answer: the boiling point elevation constant is 1.73^0C/m

Explanation:

Elevation in boiling point is given by:

\Delta T_b=i\times K_b\times m

\Delta T_b=T_b-T_b^0= = Elevation in boling point

i= vant hoff factor = 1 (for non electrolyte)

K_b =boiling point constant = ?

m= molality

\Delta T_b=i\times K_b\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}

Weight of solvent (diethylether)= 330 g = 0.33 kg

Molar mass of solute (benzophenone)= 182 g/mol

Mass of solute (benzophenone) = 38.2 g

(35.7-34.6)^0C=1\times K_b\times \frac{38.2g}{182g/mol\times 0.33kg}

K_b=1.73^0C/m

Thus the boiling point elevation constant is 1.73^0C/m

3 0
3 years ago
Considere la siguiente reacción: H, (g) +1, (a) = 2 HI (9). K, para la reacción es 54.3 a 430°C. Si se coloca H, 0.00623M, 0.004
bearhunter [10]

Answer:

[HI] = 0.0255M

[H₂] = 0.00466M

[I₂] = 0.00257M

Explanation:

Para la reacción:

H₂(g) + I₂(g) ⇄ 2HI(g)

La constante de equilibrio, K, se define como:

54.3 = [HI]² / [H₂] [I₂]

Donde cada concentración [] será la concentración en equilibrio para cada especie

Para saber la dirección del equilibrio definiremos Q como:

Q = [HI]² / [H₂] [I₂]

Donde las concentraciones [] serán las concentraciones actuales de cada gas

Reemplazando:

Q = [0.0224M]² / [0.00623M] [0.00414M]

Q = 19.5

Como Q<K, la reacción se desplazará hacia la derecha produciendo más [HI]. Así, las concentraciones en equilibrio serán:

[HI] = 0.0224M +2X

[H₂] = 0.00623M - X

[I₂] = 0.00414 - X

54.3 = [0.0224M +2X]² / [0.00623M - X] [0.00414M - X]

54.3 = 0.00050176 + 0.0896 X + 4 X² / 0.0000257922 - 0.01037 X + X²

0.00140052 - 0.563091 X + 54.3 X² =  0.00050176 + 0.0896 X + 4 X²

0.00089876 - 0.652691 X + 50.3 X² = 0

Resolviendo la ecuación cuadrática:

X = 0.001566M → Solución verdadera

X = 0.01141M → Falsa solución. Produciría concentraciones negativas

Reemplazando:

[HI] = 0.0224M +2*0.001566M

[H₂] = 0.00623M - 0.001566M

[I₂] = 0.00414 - 0.001566M

[HI] = 0.0255M

[H₂] = 0.00466M

[I₂] = 0.00257M

Siendo estas últimas, las concentraciones de las especies luego de alcanzar el equilibrio.

8 0
3 years ago
What causes global convention currents
shepuryov [24]

Answer: Land absorbs heat energy and releases heat energy quickly. Water absorbs heat energy and releases heat energy slowly. Global convection currents are set up in the atmosphere because of the unequal heating of Earth's surfaces.

7 0
4 years ago
Why do atoms form Chemical Bonds ?​
klemol [59]

Answer:

Atoms form chemical bonds to make their outer electron shells more stable. The type of chemical bond maximizes the stability of the atoms that form it. Covalent bonds form when sharing atoms results in the highest stability. Other types of bonds besides ionic and covalent chemical bonds exist, too.

5 0
3 years ago
Read 2 more answers
Other questions:
  • 6. The pOH of a solution of NaOH is 11.30. What is the [H+<br><br> ] for this solution?
    5·1 answer
  • Help me please <br> Can someone help me and explain how to find the configuration pleasee
    13·1 answer
  • Which of the following is not have kinetic energy
    7·1 answer
  • When organizing your narrative, what are the 3 sections that make up a story (planning the specific order)
    12·1 answer
  • A number of valence electrons can be determined by looking at the... *
    9·1 answer
  • If you move 50 meters in 10 seconds, what is your speed? Givens: d= t= Unknown: Formula: Plug in: Solve:
    5·1 answer
  • If the pressure of a gas is 100 kPa when the volume is measured to be 500 mL. What pressure would need to be exerted to have the
    12·1 answer
  • 38. What is the chemical formula for sodium nitride?<br> a. NaN<br> c. Na,N<br> b. Na, N<br> d. NaN;
    9·1 answer
  • Substances A and B are combined. When combined, substance A, which is a black solid, sinks to the bottom of substance B which is
    14·2 answers
  • Consider the following first order decomposition reaction with a half-life of 65 seconds at a given temperature:
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!