How many chlorine molecules are in 35.5g of chlorine gas

Answers

Answer 1

Answer: since chlorine is one of the 7 diatomic elements we know that chlorine appears as Cl₂ gas naturally. That means that the molar mass of a chlorine gas is 70.9g/mol. That being said, first you need to find the number of moles of chlorine gas that are present in a 35.5g sample. To do this divide 35.5g by the molar mass of chlorine gas (70.9g/mol) to get 0.501mol of chlorine. Then you have to multiply 0.501mol by 6.02×10²³ to get the number of chlorine gas molecules. Therefore 3.01×10²³ molecules of chlorine gas are present in a 35.5g sample.

I hope that helps. Let me know in the comments if anything is unclear.

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Why is tin foil a good insulator

Answers

Tin foil is a heat insulator because it can reflect radiation. When tin foil, for instance, is wrapped around an object, air can be trapped. Trapped air is a good insulator against convection.

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

Which of the following is the largest volume? 4.5 x 102 m3
4.5 x 107 cm3
4.5 x 104 dm3
5.0 x 108 mm3

Answers

if you convert all of the following metrics to m^3. Then the first one is the largest number. I know this stuff did it last year

A test tube containing CaCO₃ is heated until the entire compound decomposes. If the test tube plus calcium carbonate originally weighed 30.08 grams and the loss of mass during the experiment was 4.40 grams, what was the approximate mass of the empty test tube?A. 20.08 g
B. 21.00 g
C. 24.50 g
D. 25.08 g
E. 25.68 g
Can anyone explain this one for me?

Answers

Find the molar mass of CaCO3 then subtract the molar mass what it originally weighed and the loss of mass. Hopefully this works!

An atom has 11 protons, 12 neutrons, and 11 electrons. what is the charge of the atoms nucleus?A) +11
B) -11
C) 0
D) 23

Answers

Answer:

Since sodium has 11 protons, the number of neutrons must be 23 – 11 = 12 neutrons.

Explanation:

The _______ elements tend to lose electrons and form positive ions, while the _______ elements tend to gain electrons and form negative ions. A. Nonmetal, metal B. Metal, noble gas C. Metal, nonmetal D. Noble gas, nonmetal

Answers

Answer:

Explanation:

Metals tends to lose electrons and form positive ions, known as cations. Whereas, non-metals tend to gain electrons and form negative ions known as anions.

Answer:

C. Metal, nonmetal

Explanation:

Fill in the blanks

The metal elements tend to lose electrons and form positive ions, while the non-metal elements tend to gain electrons and form negative ions.

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Chemical changes do not form new compounds do not decompose the old compounds form new compounds change the appearance of the old compounds

What is the ∆G for the following reaction under standard conditions (T = 298 K) for the formation of NH4NO3(s)? 2NH3(g) + 2O2(g) NH4NO3(s) + H2O(l)Given:NH4NO3(s): ∆Hf = -365.56 kJ ∆Sf = 151.08 J/K. NH3(g): ∆Hf = -46.11 kJ ∆Sf = 192.45 J/K. H2O(l): ∆Hf = -285.830 kJ ∆Sf = 69.91 J/K. O2(g): ∆Hf = 0.00 kJ ∆Sf = 205 J/K.

Which changes will decrease the electric force between two positively charged objects? Check all that apply.moving them closer together moving them farther apart adding electrons removing electrons adding neutrons removing neutrons