CHEMISTRY MIDDLE SCHOOL

Calculate the number of molecules in a sample of carbon dioxide with a mass of 168.2 grams

Answers

Answer 1
Answer:

Answer: 2.30x10²⁴ molecules CO2

Explanation: Solution:

Convert mass of CO2 to moles

Convert moles of CO2 to molecules using Avogadro's number.

168.2 g CO2 x 1 mole CO2 / 44 g CO2 x 6.022 x10²³ molecules CO2 / 1 mole CO2

= 2.30 x10²⁴ molecules CO2
Answer 2
Answer:

Final answer:

The sample of carbon dioxide weighing 168.2 grams contains approximately 2.30 x 10^24 molecules. This is calculated by first converting the sample mass to moles, and then multiplying by Avogadro's Number.

Explanation:

To calculate the number of molecules in a sample, you need to know the formula for the substance and the molar mass of the substance. For carbon dioxide (CO2), the molar mass is 44.01 grams/mole.

The sample mass is 168.2 grams, so to calculate the number of moles, we divide the mass of the sample by the molar mass:

Number of moles = Sample Mass / Molar Mass =168.2 grams / 44.01 grams/mole = 3.82 moles (rounded to two decimal places).

The number of molecules is then calculated by multiplying the number of moles by Avogadro's Number (6.022 x 10^23 molecules/mole):

Number of molecules = Number of Moles x Avogadro's Number = 3.82 moles x 6.022 x 10^23 molecules/mole = 2.30 x 10^24 molecules (rounded to two decimal places).

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Write a balanced chemical equation for the reaction of solid strontium with fluorine gas.

Answers

Answer:

Sr(s) + F₂(g) → SrF₂(s)

Explanation:

  • A balanced equation is an equation that has an equal number of atoms of elements on either side of the equation.
  • Chemical equations are balanced to obey the law of conservation of mass which states that the mass of reactants and that of the product should always be equal in chemical reactions.
  • Therefore, the balanced chemical equation for the reaction between Sr and F₂ is given by;

Sr(s) + F₂(g) → SrF₂(s)

  • Each side of the equation has 1 atom of Sr and two atoms of F thus the equation is balanced.

Final answer:

Solid Strontium reacts with Fluorine gas in a synthesis reaction to form Strontium Fluoride. The balanced chemical equation is Sr (s) + F2 (g) -> SrF2 (s).

Explanation:

The reaction of solid strontium (Sr) with fluorine gas (F2) is a synthesis reaction, and it forms strontium fluoride (SrF2). The balanced chemical equation for this reaction is:

Sr (s) + F2 (g) → SrF2 (s)

In this equation, 's' stands for solid, 'g' stands for gas, and the arrow ( → ) indicates the direction of the reaction from reactants to products.

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The look and feel of a rocks surface is its what

Answers

It's the Texture of the rock! 

the answer is texture :):):):):):):):):):):):):)

The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the percent by mass of water in the hydrate to be 37.8%. What is the percent error for the student's measured value?(1) 5.0% (3) 1.8%

(2) 4.8% (4) 0.05%

Answers

The original or accepted value for the percent by mass of water in a hydrate = 36%
Percen by mass of water in the hydrate determined by the student
in the laboratory = 37.8%
So the difference between the actual and the percent by mass in water determined by student = (37.8 - 36.0)%
             = 1.8%
So the percentage of error made by the student = (1.8/36) * 100 percent
                                                                             = (18/360) * 100 percent
                                                                             = ( 1/20) * 100 percent
                                                                              = 5 percent
So the student makes an error of 5%. Option "1" is the correct option.

Answer:

5%

Explanation:

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Answers

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