Chemistry College

How many moles are present in a 5.8 g sample of copper?
A. 11
B. 0.091
C. 0.91
D. 5.5 x 10^22
please i need this for my finals ​

Answers

Answer 1

Explanation:

Molar mass of Cu = 63.5g/mol

Moles of Cu

= 5.8g / (63.5g/mol) = 0.091mol (B)

Answer 2

The number of moles present in a 5.8 g sample of copper is equal to 0.0913 mol. Therefore, option B is correct.

What is a mole?

A mole can be defined as an international scientific unit that is used to determine for given count of particles. The particles are commonly identical entities but they are individually distinct.

A mole of the substance can be used to evaluate a large number of atoms, molecules, or particular particles. The amount of material can be measured as chemical entities of a substance in a sample.

The number of units in 1 mole of a material is equal to 6.023×10²³ which is called Avogadro’s constant.

Given,  the mass of the copper = 5.8 g

The mass of one mole of copper = 63.5 g

We can calculate moles as, n = Mass/molar mass

Then, the number of moles of copper = 5.8/63.5 = 0.0913 mol

Therefore, the number of moles of copper is 0.0913 mol.

Learn more about the mole, here:

brainly.com/question/26416088

#SPJ2

Related Questions

What mass of carbon monoxide gas (CO) would occupy a volume of 4.30 L at STP? Explain how you got the answer.

Answers

Answer:

5.38 g of CO.

Explanation:

From the question given above, the following data were obtained:

Volume of CO = 4.3 L

Mass of CO =?

Next, we shall determine the number of mole of CO that occupied 4.3 L at STP. This can be obtained as follow:

Recall = 1 mole of any gas occupy 22.4 L at STP.

1 mole of CO occupied 22.4 L at STP.

Therefore, Xmol of CO will occupy 4.3 L at STP i.e

Xmol of CO = 4.3 / 22.4

Xmol of CO = 0.192 mole.

Thus, 0.192 mole of CO occupy 4.3 L at STP.

Finally, we shall determine the mass of CO as follow:

Mole of CO = 0.192 mole.

Molar mass of CO = 12 + 16 = 28 g/mol

Mass of CO =?

Mole = mass /Molar mass

0.192 = mass of CO / 28

Cross multiply

Mass of CO = 0.192 × 28

Mass of CO = 5.38 g.

Therefore, 5.38 g of CO occupied 4.3 L at STP.

The waste product of nuclear energy which is a possible pollutant is:
A.smoke
B.hot air
C.radiation
D.heat pollution to lake

Answers

Answer:

CCCCCCC

Explanation:

Answer:

C. radiation

Explanation:

the possible pollutant is radiation  because nuclear energy causes ; electromagnetic waves are radio waves, light, infrared rays, UV rays, X rays, Gamma rays. These are well known and are used extensively in the fields of communications, industry, medicine and research.

Radiation is a term given for waves caused by electromagnetism and high energy particles .Radioactive substances have High energy particles which are tiny bits of matter that are made to move at high speeds releasing nuclear radiation.  There are about 50 naturally occurring radioactive substances and More than 2000 man-made ones. There are three kinds of radioactive radiation – alpha particles, beta particles and gamma radiation.

How does wood produce chemical energy?

Wood absorbs oxygen to produce chemical energy.
Wood absorbs solar radiation to make chemical energy
Wood absorbs nitrogen gas to make chemical energy.
All living organisms produce unlimited amount of chemical energy.

Answers

Answer:

Wood absorbs solar radiation to make chemical energy.

The chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

The wood has been the source of energy by the burning for a long duration. The chemical energy has been stored in the dry wood has been converted to light and heat energy on burning.

The energy stored in the wood has been comprised by photosynthesis, where the solar energy has been entrapped in the wood and is converted to chemical energy that is stored.

Thus, the chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

For more information about the stored energy of wood, refer to the link:

https://brainly.com/question/20326508

The answer to the problem: (2.1x103) x (4x105) = _____, written to the correct number of significant digits and in scientific notation is:

!! Carat denotes to the power. Example: 10^4 is 104 !!

Answers

Answer:  The answer is [tex]8.4\times 10^8[/tex]

Explanation:

Significant figures : The figures in a number which express the value -the magnitude of a quantity to a specific degree of accuracy is known as significant digits.

The rule apply for the multiplication and division is :

The least number of significant figures in any number of the problem determines the number of significant figures in the answer.

Thus for product of  [tex](2.1\times 10^3)\times (4\times 10^5)[/tex]

In this problem, 2.1has 2 significant figures and 4 is an exact number with infinite significant digits thus product will have the least number of significant figures which is 2. So, the answer will be in 2 significant figures.

Therefore, the answer is [tex]8.4\times 10^8[/tex]

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