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3 years ago

What is the formula for an oxide in which the valency of nitrogen is +5

Chemistry

2 answers:

ivann1987 [24]3 years ago

7 0

Answer:

look below

Explanation:

N2O5 is the chemical formula of the compound Di nitrogen Pent oxide. It is also commonly known as nitrogen pent oxide

Elden [556K]3 years ago

4 0

N2O5 is the chemical formula of the compound Di nitrogen Pent oxide.

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3 years ago

What is the pH of a mixture of equal volumes of 0.6 mM Lactic acid and 0.4 mM NaOH?

tino4ka555 [31]

Answer:

The pH of the mixture is approximately 4.2.

There's no equilibrium calculation involved if HCl is used instead of lactic acid. The pH of that solution will be approximately 3.7.

Explanation:

<h3>Lactic Acid</h3>

Lactic acid is a monoprotic acid. In other words, each lactic acid molecule can be ionized to release only one proton. Therefore, lactic acid will react with NaOH at a 1-to-1 ratio. The result will be one unit of the anion of lactate ion.

Lactic acid is in excess. All NaOH will be consumed. Before any dissociation takes place, the solution will contain 0.2 mM of lactic acid and 0.4 mM of lactate ions.

Lactic acid is a weak acid. The following equilibrium will take place in the solution:

$\rm C_3H_6O_3 \leftrightharpoons {C_3H_5O_3}^{-} + H^{+}$ .

Let the increase in the concentration of protons in the solution be $x\rm \;M$ . Construct a RICE table:

$\begin{array}{c|ccccc}\rm \textbf{R}&\rm C_3H_6O_3 & \leftrightharpoons &\rm {C_3H_5O_3}^{-}& +& \rm H^{+}\\\textbf{I} & 0.2\times 10^{-3} && 0.4\times 10^{-3} \\\textbf{C} & -x & & +x & & +x\\\textbf{E} & 0.2\times 10^{-3} -x & & 0.4\times 10^{-3} + x & & x\end{array}$ .

The pKa value of lactic acid is 3.86. Therefore, $K_{\rm a} = 10^{-3.86}$ . By the definition of the acid dissociation constant $K_{\rm a}$ ,

$\begin{aligned} K_{\rm a} &= \frac{\rm [H^{+}][{C_3H_5O_3}^{-}]}{[\rm C_3H_6O_3]}\\& = \frac{x(0.4\times 10^{-3} +x)}{(0.6 \times 10^{-3} - x)}\end{aligned}$ .

Given that $K_{\rm a} = 10^{-3.86}$ , solve for $x$ :

$\displaystyle \frac{x(0.4\times 10^{-3} - x)}{0.2 \times 10^{-3}-x} = 10^{-3.86}$ .

There might be more than one solutions. However, the correct solution shall ensure that all concentrations are greater than zero. In this case,

$x \approx 5.7\times 10^{-5}$ .

By the definition of pH,

$\rm pH = -\log_{10}{[H^{+}]} = -\log_{10}{5.7\times 10^{-5}} \approx 4.2$ .

The Henderson-Hasselbalch equation will yield a similar result.

Similar to lactic acid, HCl is also monoprotic. The solution will contain 0.2 mM of HCl and 0.4 mM of NaCl before any ionization takes place.

Unlike lactic acid, all that 0.2 mM of HCl will ionize to produce protons and chloride ions. The final proton concentration in the solution will be 0.2 mM. As a result,

$\rm pH = - \log_{10}{[H^{+}]} = -\log_{10}{0.2\times 10^{-3}} \approx 3.6$ .

8 0

4 years ago

Xenon gas measure pd to start sith s volume of 15.5kL. If the the volume changes to the 0?6kL and the pressure becomes 44 Pa, wh

Lynna [10]

Answer:

17.03Pa

Explanation:

Given parameters:

Initial volume = 15.5kL

Final volume = 6kL

Final pressure = 44Pa

Unknown:

Original pressure = ?

Solution:

The parameters given shows pressure and volume relationship of the given gas. One of the gas laws that predicts pressure - volume relationships is the Boyle's law.

Boyle's law states that "the volume of a fixed mass of gas varies inversely as the pressure changes, if the temperature is constant".

Mathematically,

P₁V₁ = P₂V₂

where P₁ is the initial pressure

V₁ is the initial volume

P₂ is the final pressure

V₂ is the final volume

Input the variables and solve for P₁;

P₁ x 15.5 = 44 x 6

P₁ = 17.03Pa

4 0

4 years ago

What is the formula for an oxide in which the valency of nitrogen is +5​

What is the formula for an oxide in which the valency of nitrogen is +5