How many moles in 28 grams of CO2

Answers

Answer 1

Answer:

In the given question, in 28 grams of $\rm CO_2$ molecule 0.636 moles are present.

A mole is the amount of a substance which comprises exactly $6.022* 10^(23)$ 'elementary entities' of that substance.

To find the number of moles in 28 grams of $\rm CO_2$ , we first need to determine the molar mass of $\rm CO_2$ .

Molar mass of $\rm CO_2$ = 12.01 g/mol (carbon) + 2(16.00 g/mol) (oxygen)

= 44.01 g/mol

Now that we know the molar mass of $\rm CO_2$ , we can use the following formula to calculate the number of moles:

$\rm Number \ of\ moles = \frac {mass \ of \ sample\ (in \ grams) }{ molar\ mass}$

$\rm Number\ of\ moles = \frac {28 \ g }{44.01\ g/mol }$

= 0.636 mol

Therefore, there are 0.636 moles in 28 grams of $\rm CO_2$ .

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Answer 2

Answer: That is approximately .63620 grams.

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What type of charge does an neutron

Answers

Neutrons don't have a charge. they're neutral.
protons= positive
electrons= negative

Here I will give you all the charges and the names:

Neutrons: Neutral, it means no charge at all
Protons: Positive
Electrons: Negative

The oxidation number of U in UO2 is Option 1: +2 Option 2: +4 Option 3: +6 Option 4: -2

Answers

Answer: +4

Explanation:

Firstly, we know that Oxygen should have an oxidation number of -2. This is because according to oxidation rules, Oxygen's number will always be -2 unless it is a part of a peroxide and then it will be -1 (ex: H2O2). UO2 is not a peroxide, so the regular rules will apply.

We also know that oxidation numbers in a molecule with no charge should add up to zero. There are two oxygen molecules which makes their total oxidation numbers equal to -4. Therefore, whatever U's oxidation number is should cancel out that -4 to make the total number 0.

So, U's oxidation number should be +4 since -4+4=0.

What pressure in atmospheres(atm) is equal to 45.6 kPa?

Answers

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In order to get a reaction started the reactants of this type of reaction require the greatest amount of energy:a. fusion
b. fission
c. physical
d. chemical

Answers

The answer is A. Fusion is a reaction type that in order to initiate the reaction a greatest amount of energy should be inputted. This reaction involves two or more atomic nuclei coming very close to each other then colliding and eventually joining to form a new nucleus. The energy needed to do this is very large.

Note from the formulas of the reactants that one is an acid and one is a base. The precipitate formed is therefore a salt. What is the balanced formula for this salt?1. OH
2. Ba2SO4
3. BaSO4
4. Ba(SO4)2

Answers

BaSO4 is the answer for this question i did the math

Answer:

3. BaSO4

Explanation:

the math will show you, and to answer your commented question "How does this evidence indicate that the reaction has occurred between ions ?" :

The reaction of the ions can be checked by a number of methods. In a chemical reaction, the ions are in the aqueous solution. This means that they are in solution, dissolved with charge. During the reaction (ionic) there is an attraction between the positive and negative ions. This makes a change in the state of the reactants in the products. In addition, the reaction can result in an immediate observable change such as the formation of a solid or precipitation.

Evaluate these two sound waves and determine what property they have In common

Answers

Answer:

The same wavelength

Explanation:

The two sound waves shown in the diagram has the same wavelength as clearly shown.

Wavelength of a wave is the distance between a complete wave cycle.
It is the difference between successive train of troughs and crests.
In the figure shown the amplitude, vertical displacement of the wave differs.
But the wavelength of the waves are the same.

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