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3 years ago

Consider the following reversible reaction.

Chemistry

2 answers:

Marina86 [1]3 years ago

7 0

Answer:

B is the correct option

Explanation:

K= the ratio of product of concentration of products to the product of concentration of reactants raised to power equal to their cofficients.

Fofino [41]3 years ago

6 0

Answer:

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If the half-life of 37Rb is 4.7x101 years, how long would it take for 0.5 grams of a 2 gram sample to radioactively decay?

k0ka [10]

Answer: The time required will be 19.18 years

Explanation:

All the radioactive reactions follows first order kinetics.

The equation used to calculate half life for first order kinetics:

$k=\frac{0.693}{t_{1/2}}$

We are given:

$t_{1/2}=4.7\times 10^1yrs$

Putting values in above equation, we get:

$k=\frac{0.693}{4.7\times 10^1yr}=0.015yr^{-1}$

Rate law expression for first order kinetics is given by the equation:

$k=\frac{2.303}{t}\log\frac{[A_o]}{[A]}$

where,

k = rate constant = $0.015yr^{-1}$

t = time taken for decay process = ?

$[A_o]$ = initial amount of the reactant = 2 g

[A] = amount left after decay process = (2 - 0.5) = 1.5 g

Putting values in above equation, we get:

$0.015yr^{-1}=\frac{2.303}{t}\log\frac{2}{1.5}\\\\t=19.18yrs$

Hence, the time required will be 19.18 years

4 0

3 years ago

Which of the following acids has the weakest conjugate base?

Marina86 [1]

Answer:

Conjugate base of chloroacetic acid will be weakest.

Explanation:

$K_{a}$ of an acid is a parameter to predict it's acidic strength.

Higher the $K_{a}$ , higher will be acid dissociation . Hence acidity will be higher.

We know that the stronger an acid, the weaker it's conjugate base. So higher the $K_{a}$ value of an acid, weaker will be it's conjugate base.

The order of $K_{a}$ value: $(d)(1.26\times 10^{-3})> (e)(10^{-3})> (c)(10^{-3.8})> (b)(10^{-4.1})> (a)(6.31\times 10^{-5})$

So, conjugate base of chloroacetic acid will be weakest.

5 0

3 years ago

Which of the following is a mixture Water Ink Alcohol Mercury

Zepler [3.9K]

Paper chromatography can be applied to "ink" to determine if it is a pure substance or a "mixture" of pure substances (in which two or more pure substances are combined). Since, tested with paper chromatography, "ink" separates into its constituent pure substances, Ink is a mixture.

I hope this helps.

P.S. Thank you for choosing me as brainliest answer on my last.

4 0

3 years ago

Read 2 more answers

How many moles are present in

olasank [31]

Answer: (a) There are 0.428 moles present in 12 g of $N_{2}$ molecule.

(b) There are 2 moles present in $12.044 \times 10^{23}$ particles of oxygen.

Explanation:

(a). The mass of nitrogen molecule is given as 12 g.

As the molar mass of $N_{2}$ is 28 g/mol so its number of moles are calculated as follows.

$No. of moles = \frac{mass}{molar mass}\\= \frac{12 g}{28 g/mol}\\= 0.428 mol$

So, there are 0.428 moles present in 12 g of $N_{2}$ molecule.

(b). According to the mole concept, 1 mole of every substance contains $6.022 \times 10^{23}$ atoms.

Therefore, moles present in $12.044 \times 10^{23}$ particles are calculated as follows.

$Moles = \frac{12.044 \times 10^{23}}{6.022 \times 10^{23}}\\= 2 mol$

So, there are 2 moles present in $12.044 \times 10^{23}$ particles of oxygen.

4 0

3 years ago

How many electrons in an atom can share the quantum numbers n=3, l=2 and m subscript l=2?

Nadusha1986 [10]

If you mean m (subscript l) is (-2,-1,0,1,2)
its a 3d orbital so it can hold 2 electrons, however, like in an electron diagram a 3d orbital has 5 boxes can can hold 2 electrons that is how i got 10 total but if you mean just in box 2 then only 2 can share it.

Does that make sense?

6 0

3 years ago

Read 2 more answers