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3 years ago

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Chemistry

1 answer:

Lelechka [254]3 years ago

3 0

Answer:

D. 45.0 g

Explanation:

In present reaction, 1 mol of N2 react with 3 moles of H2 to generate 2 moles of NH3

Thus, 2 moles of NH3 ≡ 3 moles of H2

Therefore, 15 moles of NH3 ≡ (3×15)/2 = 22.5 moles of H2.

We know that, 1 mole of H2 ≡ 2 g

Therefore, 22.5 moles of H2 ≡ 2 × 22.5 = 45 g

Thus, 45 g of hydrogen are needed to produce 15.0 mol of ammonia, if the reaction goes to completion

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Which compound would produce an acidic aqueous solution? Which compound would produce an acidic aqueous solution? RbH C2H2 PH3 C

Anvisha [2.4K]

Answer: Option (e) is the correct answer.

Explanation:

A compound that will dissociate in water or an aqueous solution to give hydrogen ions( $H^{+}$ ) is known as an acidic substance.

When RbH is dissolved in aqueous solution then it dissociates as follows.

$RbH \rightarrow Rb^{+} + H^{-}$ .

$C_{2}H_{2}$ is non-polar in nature. So, it will not dissociate into ions when dissolved in an aqueous solution.

$PH_{3}$ will also remain neutral and does not dissociate into ions.

$CaH_{2}$ when dissolved in water then it dissociates as follows.

$CaH_{2} \rightarrow Ca^{2+} + 2H^{-}$

Whereas when HF is dissolved in aqueous solution then the reaction will be as follows.

$HF \rightarrow H^{+} + F^{-}$

Thus, we can conclude that out of the given options HF is the compound which will produce an acidic aqueous solution.

4 0

4 years ago

Read 2 more answers

the atomic number of barium is 56. What do you know about the subatomic particles in an atom of this element ?

Deffense [45]

You definitely know that is has 56 protons and 56 electrons because atomic number is proton number and protons=electrons

7 0

4 years ago

A 1.25 g gas sample occupies 663 ml at 25∘ c and 1.00 atm. what is the molar mass of the gas?

lakkis [162]

Using ideal gas equation,

$P\times V=n\times R\times T$

Here,

P denotes pressure

V denotes volume

n denotes number of moles of gas

R denotes gas constant

T denotes temperature

The values at STP will be:

P=1 atm

T=25 C+273 K =298.15K

V=663 ml=0.663L

R=0.0821 atm L mol ⁻¹

Mass of gas given=1.25 g g

Molar mass of gas given=?

$Number of moles of gas, n= \frac{Given mass of the gas}{Molar mass of the gas}$

$Number of moles of gas, n= \frac{1.25}{Molar mass of the gas}$

Putting all the values in the above equation,

$1\times 0.663=\frac{1.25}{Molar mass of the gas}\times 0.0821\times 298.15$

Molar mass of the gas=46.15

3 0

3 years ago

The elements that combine to form water

forsale [732]

When molecular hydrogen (H2) and oxygen (O2) are combined and allowed to react together, energy is released and the molecules of hydrogen and oxygen can combine to form either water or hydrogen peroxide.

8 0

3 years ago

An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 125 amu and 127 amu, with natural abunda

mrs_skeptik [129]

Answer:

The average atomic mass is 126.1

Explanation:

To obtain the atomic mass of the isotope we use this formula;

(% composition of isotope 1 * mass number) + (% composition of isotope 2 * mass number)

1. Equate the percentage composition with the mass number of each isotope

45/100 * 125 = 56.25

55/100 * 127 = 69.85

2. Add both answers together you get,

56.25 + 69.85 = 126.1.

The average atomic mass is therefore 126.1

8 0

3 years ago