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2 years ago

How many kilograms are in 4 moles of Na2CO3?

1 answer:

6 0

First you need to find the amount of mass of Na2CO3 in one moles
(Use periodic chart)

Na= 22.99 x 2 = 45.98
C = 12.01
O = 16.00 x 4 = 64.00

Add the molar masses together to get 121.99

To find how many grams are in 4 moles, times 121.99 by 4
This gives you 487.96

But the questions asks for the answer to be in kilograms nor grams, to change into kilograms divide by 1000
This gets you the answer: 0.49 kg

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To show the electron configuration for an atom, when would it be better to use an orbital notation than to use a written configu

VikaD [51]

The answer is <span>D.when the aim is to show electron distributions in shells. This is because there are some instances when elements don't possess a regular or normal electron configuration. There are those who have special electron configurations wherein a lower subshell isn't completely filled before occupying a higher subshell. It is best to visualize such cases using the orbital notation.</span>

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1 year ago

Given the following equation and heat of reaction: 2 moles of A combine with 2 moles of B to produce 6 moles of C and 26 kJ What

Hoochie [10]

Answer: The change in enthalpy will be -13.

Explanation:-

Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.

$\Delta H$ for Endothermic reaction is positive and $\Delta H$ for Exothermic reaction is negative.

$2A+2B\rightarrow 6C+26kJ$

$2A+2B\rightarrow 6C$ $\DeltaH=-26kJ$

When 1 mole of A combining with 1 mole of B to produce 3 moles of C

Thus as the stoichiometry has got half of the original , enthalpy of the reaction will also get half.

Thus for reaction :

$A+B\rightarrow 3C+\frac{26}{2}kJ$

$A+B\rightarrow 3C$ $\DeltaH=-13kJ$

Thus the change in enthalpy will be -13.

8 0

1 year ago

Which set of properties does a substance such as CO2(g) have?

mylen [45]

Since CO2 (Carbon Dioxide) is a gas these properties would be: -no definite shape and volume. A gas is invisible and colorless to the human naked eye. An example of pure gas would be like air. Just like air, you see no definite shape and weight or volume.

5 0

2 years ago

Is iron bromide magnetic if no why

Nataly_w [17]

Iron bromide isn't considered magnetic because all iron compounds are not magnetic

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1 year ago

Read 2 more answers

1. For which of these elements would the first ionization energy of the atom be higher than that of the diatomic molecule?

Lyrx [107]

Answer: Option (b) is the correct answer.

Explanation:

The energy necessary to remove an electron from a gaseous atom or ion is known as ionization energy.

This means that smaller is the size of an atom more amount of energy has to be supplied to it in order to remove the valence electron. This is because in small atom or element there will be strong force of attraction between the nucleus and electrons.

So, high amount of energy has to be supplied to remove the valence electrons.

As electronic configuration of helium is $1s^{2}$ . So, due to completely filled valence shell it is more stable in nature.

As a result, we need to provide very high amount of energy to remove an electron from a helium atom.

Thus, we can conclude that out of the given options helium element would the first ionization energy of the atom be higher than that of the diatomic molecule.

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2 years ago