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4 years ago

Which of the following reactions Shows a chemical change producing a gas? APEX

Chemistry

2 answers:

Rufina [12.5K]4 years ago

5 0

A. is the answer for Apex.

Nina [5.8K]4 years ago

4 0

Answer: $2CH_3OH(l)+3O_2(g)\rightarrow2CO_2(g)+4H_2O(l)$

Explanation: A chemical change is a reaction in which chemical composition of the substance changes. Some bonds are broken and some new bonds are formed.

The reactants are written in terms of their chemical formula on the left hand side and the products are written in terms of their chemical formula on right hand side with a arrow in between. The chemical symbols are followed by their physical states such as (l) for liquid, (s) for solid, (g) for gas and (aq) for aqueous.

Thus the only reaction producing a gas is $2CH_3OH(l)+3O_2(g)\rightarrow2CO_2(g)+4H_2O(l)$

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kumpel [21]

Answer:

Final concentration of NaOH = 0.75 M

Explanation:

For $NaOH$ :-

Given mass = 90.0 g

Molar mass of NaOH = 39.997 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{90.0\ g}{39.997\ g/mol}$

$Moles\ of\ NaOH= 2.2502\ mol$

Molarity is defined as the number of moles present in one liter of the solution. It is basically the ratio of the moles of the solute to the liters of the solution.

The expression for the molarity, according to its definition is shown below as:

$Molarity=\frac{Moles\ of\ solute}{Volume\ of\ the\ solution}$

Where, Volume must be in Liter.

It is denoted by M.

Given, Volume = 3.00 L

So,

$Molarity=\frac{2.2502\ mol}{3.00\ L}=0.75\ M$

<u>Final concentration of NaOH = 0.75 M</u>

5 0

4 years ago

Calculate the pH of a solution with an H+ ion concentration of 9.36 x 10-3 M ?

mel-nik [20]

Answer:

The answer is 2.03

Explanation:

The pH of a solution can be found by using the formula

$pH = - log [ {H}^{+} ]$

where H+ is the Hydrogen ion concentration

From the question we have

$pH = - log(9.36 \times {10}^{ - 3} ) \\ = 2.02872415...$

We have the final answer as

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3 years ago

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madreJ [45]

Answer:

Explanation:

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