CHEMISTRY HIGH SCHOOL

How many molecules are in 165 g of carbon dioxide?

Answers

Answer 1

Answer:

Answer: $22.6 * 10^(23)$ molecules

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

For $CO_2$

Given mass= 165 g

Molar mass of $CO_2$ = 44 g/mol

Putting values in above equation, we get:

$\text{Moles of}CO_2 =(165g)/(44g/mol)=3.75mol$

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023* 10^(23)$ of particles.

1 mole of $CO_2$ contains = $6.023* 10^(23)$ molecules of $CO_2$

Thus 3.75 moles $CO_2$ contains = $(6.023* 10^(23))/(1)* 3.75=22.6 * 10^(23)$ molecules of $CO_2$

Thus there will be $22.6 * 10^(23)$ molecules of $CO_2$

Answer 2

Answer:

The molar mass of CO2 is 44 grams per mole.

165 grams / 44 grams per mole of CO2 = 3.75 moles CO2

Using Avogadro’s law where 1 mole of substance equals 6.023 x 10^23 molecules

3.75 moles CO2 (6.023 x 10^23 molecules /mole) = 2.26 x 10^24 molecules CO2

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The atomic masses in the Periodic Table are not integral numbers. For example, carbon is listed as 12.011 amu instead of 12.000 amu. Why?

Answers

The reason that the atomic masses shown on the periodic table include fractions, is to account for the other isotopes of the element, not just the pure element. Remember, an isotope is a atom of an element with a reduced or increased number of neutrons. This changes the atomic mass but not the charge. The number is calculated by multiplying the atomic mass of each isotope of the element with its percent abundance found in nature. Therefore it is an averaged atomic mass for all of the element. For example, carbon-12 may (I don't know the real numbers) have a % abundance of 98.5%, and carbon-14 may have a percent abundance of 1.5%, so that is why carbon would have an atomic mass greater than 12.000.

Which is the best example of technological design

Answers

Well, actually there are many examples. But, the one i know best is the touch mouse by Microsoft.

Based on its location on the periodic table, which metal is likely to be less reactive than rubidium and more reactive than calcium?potassium (K)

cesium (Cs)

magnesium (Mg)

titanium (Ti)

Answers

Answer: Potassium is the element which is less reactive than rubidium and more reactive than Calcium.

Explanation: Reactivity of an metal is defined as the tendency to loose electrons easily. In a periodic table, the reactivity increases down the group as size of the metal increases. The reactivity decreases across a period as the size of the metal decreases.

Rubidium lies in group 1, which has elements in the series: H, Li, Na, K, Rb, Cs and Fr.

And Calcium lies in period 4 which has elements in the series: K, Ca, (1st transition series), Ga, Ge, As, Se, Br and Kr.

So, the element to have reactivity more than rubidium and less than Calcium must be Potassium (K).

Answer:

A is the correct answer on edge

Explanation:

A)potassium (K)

What is a common use of bases?

Answers

A base is a substance that is capable of donating hydroxide ions or electrons or accepts protons. Some of the common bases are found at home. Lye (active ingredient in oven cleaners) and soaps are some of the examples. Bases are used to neutralize acids, they are used as cleaning agents and are used to manufacture paper and synthetic fiber.

The common uses of base if for the formation of salts in a neutralisation reaction.

What is neutralisation reaction?

Neutralisation reaction is a type of chemical reaction whereby salt and water is formed from the reaction of an acid and a base.

For example the reaction between NaOH and HCl leads to the formation of a salt called NaCl.

Therefore, the common uses of base if for the formation of salts in a neutralisation reaction.

Learn more about neutralisation reaction here:

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Please help! I'd appreciate it a lot!

Answers

Answer:

6 is B, 7 is A

Explanation:

Identify which one of these are exact numbers. (Can be more than 1) a. 2.54 cm ( the number of centimeters in exactly 1 in)
b. 56.00 s ( a time measured by a stopwatch)
c. 4 choices ( the number of choices in this list)
d. 3 lbs ( the weight of an object measured on a scale )

Answers

Answer: a. 2.54 cm ( the number of centimeters in exactly 1 in) and c. 4 choices ( the number of choices in this list)

Justification:

1) a. 2.54 cm ( the number of centimeters in exactly 1 in)

Although the exact length of one inch has varied in the past, currently the inch is defined as exactly 2.54 cm, so this is an exact number.

b. 56.00 s ( a time measured by a stopwatch)

The time measured by a stopwatch is not an exact number. The number is limited by the precision of the instrument (the stopwatch) and it migh have been 56.004 instead of 56.00, and the stopwatch cannot shoe that. So, this is not an exact number.

c. 4 choices ( the number of choices in this list)

This is, indeed an exact number. It is 4, not 4.1, nor 3.9, nor any other number.

d. 3 lbs ( the weight of an object measured on a scale )

As reasoned with the stopwatch, this measure, 3 lbs, is subject to the precision of the scale. It is not an exact number. It could be other number close to 3: 2.99 for example.

These are exact numbers: c. 4 choices ( the number of choices in this list) and d. 3 lbs ( the weight of an object measured on a scale )

Further explanation

The exact number is a value that is known with complete certainty. Examples are counted numbers of objects or certain unit conversions such as exactly 3 feet in 1 yard. Another example is, a dozen is defined as 12 objects, and a pound is defined as 16 ounces.

Fraction an exact number is a fraction takes two integers and places them in a ratio, for example 3/4 or 10/15. A decimal can express the same numerical quantity, but it does so with a single number (like 0.75 or 0.66). So, the fraction makes the relationship among numbers clear in the way it is written.

While a decimal can express the same numerical quantity, but it does so with a single number (like 0.75 or 0.66).

a. 2.54 cm ( the number of centimeters in exactly 1 in) is decimal

b. 56.00 s ( a time measured by a stopwatch) is not exact numbers

c. 4 choices ( the number of choices in this list) is exact numbers

d. 3 lbs ( the weight of an object measured on a scale ) is exact numbers

Learn more

Learn more about exact number brainly.com/question/1847531

Answer details

Grade: 9

Subject: chemistry

Chapter: exact number

Keywords: exact number

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