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3 years ago

What is the mass of one mole of H

Chemistry

1 answer:

arsen [322]3 years ago

4 0

Answer:

1.008 grams

Explanation:

This numbers are either in grams per mole of atoms or atomic mass unit

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Which of the following is not a conjugate acid-base pair? A) NH4+/NH3 B) H30-OH OC) H2SO3/HSO3 D) C2H302-/HC2H302

raketka [301]

Answer : The option (d) is not a conjugate acid-base pair.

Explanation :

According to the Bronsted Lowry concept, Bronsted Lowry-acid is a substance that donates one or more hydrogen ion in a reaction and Bronsted Lowry-base is a substance that accepts one or more hydrogen ion in a reaction.

Or we can say that, conjugate acid is proton donor and conjugate base is proton acceptor.

(a) The equilibrium reaction will be,

$NH_4^++OH^-\rightleftharpoons NH_3+H_2O$

In this reaction, $NH_4^+/NH_3$ are act as a conjugate acid-base.

(b) The equilibrium reaction will be,

$H_3O^++OH^-\rightleftharpoons H_2O+H_2O$

In this reaction, $H_3O^+/OH^-$ are act as a conjugate acid-base.

(c) The equilibrium reaction will be,

$H_2SO_3+OH^-\rightleftharpoons HSO_3^-+H_2O$

In this reaction, $H_2SO_3/HSO_3^-$ are act as a conjugate acid-base.

(d) The equilibrium reaction will be,

$C_2H_3O_2^-+H_2O\rightleftharpoons HC_2H_3O_2+OH^-$

In this reaction, $C_2H_3O_2^-/HC_2H_3O_2$ are act as a conjugate base-acid.

Hence, from this we conclude that, the option (d) is not a conjugate acid-base pair but it is a act as conjugate base-acid.

6 0

3 years ago

1. Which of the following does NOT indicate that a chemical change may have taken place?

mojhsa [17]

A fracture Formation .
A matter is neither destroyed or created

8 0

3 years ago

In the synthesis of barium carbonate from an alkali metal carbonate (M2CO3 where M is one of the alkali metals) a student genera

Paraphin [41]

Answer:

0.019 moles of M2CO3

Explanation:

M2CO3(aq) + BaCl2 (aq) --> 2MCl (aq) + BaCO3(s)

From the equation above;

1 mol of M2CO3 reacts to produce 1 mol of BaCO3

Mass of BaCO3 formed = 3.7g

Molar mass of BaCO3 = 197.34g/mol

Number of moles = Mass / Molar mass = 3.7 / 197.34 = 0.0187 ≈ 0.019mol

Since 1 mol of M2CO3 reacts with 1 mol of BaCO3,

1 = 1

x = 0.019

x = 0.019 moles of M2CO3

3 0

3 years ago

Small quantities of hydrogen gas can be prepared in the laboratory by the addition of aqueous hydrochloric acid to metallic zinc

Alexxx [7]

Explanation:

The given data is as follows.

Pressure of moist hydrogen gas = 1.018 atm

Pressure of water vapor = $32 torr \times \frac{1 atm}{760 torr}$

= 0.0421 atm

Formula to calculate the pressure of dry hydrogen gas is as follows.

Pressure of $H_{2}$ gas = $P_{moist H_{2}} - P_{H_{2}O}$

Now, putting the given values into the above formula as follows.

Pressure of $H_{2}$ gas = $P_{moist H_{2}} - P_{H_{2}O}$

= 1.018 atm - 0.0421 atm

= 0.976 atm

Therefore, we can conclude that partial pressure of hydrogen gas in the given sample is 0.976 atm.

8 0

3 years ago

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A nuclear reactor is surrounded by a thin wall of glass filled with a cooling fluid. true or false

likoan [24]

Yes i guess it is true

6 0

3 years ago