Chemistry

Contributor-Level 10

Fraction of molecules having enough energy to form product = $e^{- E a / R T}$ $^{}$

Fraction of molecules having enough energy to form product = $e^{- \frac{80.9 * 1 0^{3}}{8.314 * 700}}$ $^{\frac{^{}}{}}$

$= e^{- 13.8} ≅ e^{- 14}$

So, x = 14

0 0

New answer posted

10 months ago

Chemistry Equilibrium

For the reaction A_(g) ® B_(g) the value of the equilibrium constant at 300K and 1 atm is equal to 100.0 The value of for the reaction at 300K and 1 atm in J mol^-¹ is -xR, where x is_________.

(Rounded off to the nearest integer)

[R = 8.31 J mol^-¹ K^-¹ and In 10 = 2.3]

0 Follower 2 Views

Contributor-Level 10

A (g) -> B (g) K_P = 100

$Δ G$ at 300 K and 1 atm

Using

$Δ G = - R T l n K_{P}$

$Δ G = - R * 300 l n 100$

=-R * 300 * 2 * 2.3

$Δ G = - 1380 R$

So; x = 1380.

0 0

New answer posted

10 months ago

When 12.2g of benzoic acid is dissolved in 100g of water, the freezing point of solution was found to be -0.93°C $[K_{f} (H_{2} O = 1.86 K k g m o l^{- 1}] .$ The number (n) of benzoic acid molecules associated (assuming 100% association) is…………,

0 Follower 5 Views

Chemistry Chemistry Coordination Compounds

Contributor-Level 10

$Δ T_{f} = K_{f} * m * i$

0.93 = 1.86 * 1 * i

i = $\frac{1}{2}$ $i = 1 + (\frac{1}{n} - 1)$ $\frac{}{}$

$∴ n = 2$

0 0

New answer posted

10 months ago

The stepwise formation of ${[C u {(N H_{3})}_{4}]}^{2}^{+}$ is given below:

$C u^{2 +} + N H_{3} \overset{k_{1}}{?} {[C u (N H_{3})]}^{2 +}$

${[C u (N H_{3})]}^{2 +} + N H_{3} \overset{k_{2}}{?} {[C u {(N H_{3})}_{2}]}^{2 +}$

${[C u {(N H_{3})}_{2}]}^{2 +} + N H_{3} \overset{k_{3}}{?} {[C u {(N H_{3})}_{3}]}^{2 +}$

${[C u {(N H_{3})}_{3}]}^{2 +} + N H_{3} \overset{k_{4}}{?} {[C u {(N H_{3})}_{4}]}^{2 +}$

The value of stability constants k₁, k₂, k₃ and k₄ are $1 0^{4}, 1.58 * 1 0^{3}, 5 * 1 0^{2} a n d 1 0^{2}$ respectively.

The overall equilibrium constants for dissociation of ${[C u {(N H_{3})}_{4}]}^{2 +} i s x * 1 0^{- 12} .$ The value of x is________ (Rounded off to the nearest integer)

0 Follower 2 Views

Contributor-Level 10

Stability constant are :

K₁ = 10⁴

K₂ = 1.58 * 10³

K₃ = 5 * 10²

K₄ = 10²

Overall stability constant K will be

K = K₁ * K₂ * K₃ * K₄

= 7.9 * 10¹¹

Now, overall equilibrium constant for dissociation of [Cu (NH₃)₄]²⁺ is

$K' = \frac{1}{K} = \frac{1}{7.9 * 1 0^{11}} = 0.126 * 1 0^{- 11}$

= 1.26 * 10^-12

So; x = 1 (Rounded off to the nearest integer)

0 0

New answer posted

10 months ago

In mildly alkaline medium, thiosulphate ion is oxidized by $M n O_{4}^{-}$ to “A”. The oxidation state of sulphur in 'A' is………….

0 Follower 2 Views

Contributor-Level 10

$M n O_{4}^{-} + S_{2} O_{3}^{2 -} \overset{O H^{-}}{\to} M n O_{2} + S O_{4}^{2 -}$

O.S of S in $S O_{4}^{2 -} = + 6$

0 0

New answer posted

10 months ago

The number of octahedral voids per lattice site in a lattice is………. (Rounded off to the nearest integer)

0 Follower 3 Views

Contributor-Level 10

Effective no. of octahedral voids in a lattice = n

Effective no. of lattice point in a lattice = n

$∴$ Ratio = n/n = 1

0 0

New answer posted

10 months ago

The average S – F bond energy in kJ mol^-1 of SF₆ is………… (Rounded off to the nearest integer) [Given : The values of standard enthalpy of formation of SF₆(g), S(g) and F(g) are – 1100, 275 and 80 kJ mol^-1 respectively.]

0 Follower 2 Views

Contributor-Level 10

$S (g) + 6 F (g) \to S F_{6} (g)$

$Δ {H^{0}}_{R} = Δ {H^{0}}_{f} (S F_{6}) - Δ {H^{0}}_{f} (S) - 6 * Δ {H^{0}}_{f} (F)$

= (-1100) (275) 6 (80) = 1855

$Δ {H^{0}}_{S - F} = \frac{1855}{6} = 309.16 K J / m o l ≅ 309$

0 0

New answer posted

10 months ago

Number of amphoteric compounds among the following is___________.

0 Follower 2 Views

Contributor-Level 10

Beo & Be (OH)₂ are amphoteric in nature, because they react with both acid and base

0 0

New answer posted

10 months ago

Chemistry Class 11th

The gas released during anaerobic degradation of vegetation may lead to:

0 Follower 2 Views

Contributor-Level 10

Methane gas is produced during anaerobic degradation of vegetation that leads to global warming so considered as greenhouse gas like CO₂. Also it causes cancer.

0 0

New answer posted

10 months ago

Chemistry Class 11th

Which pair oxides in acidic in nature?

0 Follower 1 View