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3 years ago

Help pleaseee

Chemistry

1 answer:

marissa [1.9K]3 years ago

6 0

Answer:

In order to find the molecular formula from an empirical formula you must find the ratio of their molecular masses.

We know that the molecular mass of the molecule is 70

gmol-1

. We can calculate the molar mass of

CH2

from the periodic table:

C=12.01

gmol−1

H=1.01

gmol−1

CH2 =14.03

gmol−1

Hence we can find the ratio:

14.03

≈

0.2

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Using the equation below, if you have 4.3 mol of nitrogen tribromide and

ankoles [38]

Answer:

sodium hydroxide is the limiting reactant

Explanation:

The first step is usually to put down the balanced reaction equation. This is the first thing to do when solving any problem related to stoichiometry. The balanced reaction equation serves as a guide during the solution.

2NBr3 + 3NaOH = N2 + 3NaBr + 3HOBr

Let us pick nitrogen gas as our product of interest. Any of the reactants that gives a lower number of moles of nitrogen gas is the limiting reactant.

For nitrogen tribromide

From the balanced reaction equation;

2 moles of nitrogen tribromide yields 1 mole of nitrogen gas

4.3 moles of nitrogen tribromide will yield 4.3 ×1/ 2 = 2.15 moles of nitrogen gas

For sodium hydroxide;

3 moles of sodium hydroxide yields 1 mole of nitrogen gas

5.9 moles of sodium hydroxide yields 5.9 × 1/ 3= 1.97 moles of nitrogen gas

Therefore, sodium hydroxide is the limiting reactant.

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What volume of 12 M NaOH and 2 M NaOH should be mixed to get 2 litres of 9 M NaOH solution?

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3 years ago

Choose the following statements that show evidence for a chemical reaction.

Leno4ka [110]

Explanation:

A chemical reaction is defined as the reaction in which bonds between the reactants either break or form which leads to the formation of a new substance.

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So, when we drop a sodium metal into water then it produces a frizzing sound which shows the metal is reacting with water.

We know that when two aqueous solutions chemically react with each other then it may lead to the formation of an insoluble substance which is known as precipitate.

This means that formation of a precipitate is also a chemical reaction.

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Dropping sodium metal into water produces fizzing.

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Solubility (polar vs. Nonpolar)

eduard

<u>Explanation:</u>

It is given that polar solutes can be dissolved in polar solvents and non-polar solutes can be dissolved in non-polar solvent.

Alcohol being polar, does not dissolves ionic salt in it.

$CCl_4$ is a non-polar solvent.

From the given options:

1. NaCl: This is an ionic salt and hence, it will be soluble in water only.

2. $I_2$ : Iodine gas is a non-polar solute and hence, will be dissolved in non-polar solvent which is $CCl_4$

3. Ethanol: As, it is a polar molecule and is not an ionic salt, therefore it can be soluble in both water and alcohol.

4. Benzene: It is a non-polar molecule and hence, it will be dissolved in $CCl_4$

5. $Br_2$ : Bromine gas is a non-polar solute and hence, will be dissolved in $CCl_4$

6. $KNO_3$ : This is an ionic salt and hence, it will be soluble in water only.

7. Toluene: This is a non-polar solute and hence, will be dissolved in $CCl_4$

8. $Ca(OH)_2$ : This is an ionic salt and hence, it will be soluble in water only.

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