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2 years ago

What is the molality of a solution containing 15 g NaCl dissolved in 50 g of water

Chemistry

2 answers:

enot [183]2 years ago

7 0

Answer:

cdjkekendnekekekeknenwkwkwkwnrnrnrjejjwjwksnsjnrheifjfuufjeenenej

faltersainse [42]2 years ago

4 0

Hopes this helps:

Answer: 5.132 mol/kg

How I got the answer I looked it up. Please mark as brainlist if it’s right.

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Which sequence represents the correct ranking of the amount of nitrogen per molecule, from least to most nitrogen? Urea, uric ac

Reptile [31]

Answer:

Ammonia, urea, uric acid

Explanation:

The given compounds are:-

Urea which has a molecular formula of $CH_4N_2O$ and has 2 atoms of nitrogen per molecule.

Ammonia which has a molecular formula of $NH_3$ and has 1 atom of nitrogen per molecule.

Uric acid which has a molecular formula of $C_5H_4N_4O_3$ and has 4 atoms of nitrogen per molecule.

Thus,

The order from least to most nitrogen is:-

Ammonia, urea, uric acid

5 0

2 years ago

Plz help me with this:

In-s [12.5K]

Answer:

1) H 1s^1

2) [Ar] 3d⁸ 4s²

3) [He] 2s2 2p3

4) [Kr] 4d10 5s2 5p5

5) [Ar] 4s² and [Ar] 4s²

6) [He] 2s2 2p2

7) [He] 2s² 2p⁴

8) [Ar] 3d7 4s2

9) [Kr] 4d¹⁰ 5s¹

10) [Ne] 3s² 3p⁶

Explanation:

7 0

3 years ago

Tap water at room temperature has a pH of 7.2 and carbonate alkalinity of 200 mg/L (= 40 mmol/L). What is the concentration of b

UNO [17]

Answer:

the concentration of bicarbonate is [HCO₃⁻] = 0,03996 M and carbonate is [CO₃²⁻] = 3,56x10⁻⁵ M.

Explanation:

Carbonate-bicarbonate is:

HCO₃⁻ ⇄ CO₃²⁻ + H⁺ With pka = 10,25

Using Henderson-Hasselbalach formula:

pH = pka + log₁₀ $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$

7,2 = 10,25 + log₁₀ $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$

8,91x10⁻⁴ = $\frac{[CO_{3}^{2-}]}{[HCO_{3}^-]}$ (1)

Also:

0,040 M = [CO₃²⁻] + [HCO₃⁻] (2)

Replacing (2) in 1:

[HCO₃⁻] = 0,03996 M

Thus:

[CO₃²⁻] = 3,56x10⁻⁵ M

I hope it helps.

4 0

3 years ago

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d8

MAXImum [283]

Answer:

Pd (palladium).

Explanation:

46 electrons total, this is representative of the Pd (palladium) element.

5 0

3 years ago

For The Reaction CH3COOH ---> CH3COO- + H+, which of the following statements is true? A.) Ch3COOH is a Bronsted Lowry base.

Savatey [412]

Answer: Option (C) is the correct answer.

Explanation:

According to Arrhenius, bases are the species which when dissolved in water will give hydroxide ions, that is, $OH^{-}$ .

For example, $NaOH + H_{2}O \rightarrow Na^{+} + OH^{-}$

Arrhenius acids are the species which when dissolved in water will give hydrogen ions, that is, $H^{+}$ .

For example, $CH_{3}COOH + H_{2}O \rightleftharpoons H_{3}O^{+} + CH_{3}COO^{-}$

In water, when an acid loses a hydrogen ion then the specie formed is known as conjugate base.

Here, $CH_{3}COO^{-}$ is the conjugate base of $CH_{3}COOH$ .

Similarly, species which accept the hydrogen ion result in the formation of conjugate acid.

Hence, $H_{3}O^{+}$ is the conjugate acid of $H_{2}O$ .

Thus, we can conclude that $CH_{3}COO^{-}$ is the conjugate base.

7 0

3 years ago

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