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3 years ago

Which one of the samples contains the most molecules?

Chemistry

1 answer:

Alex3 years ago

7 0

Answer: D is right

Explanation: One mole contains 6.0225 ·10^23 molecules

Despite of the substance

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What is the purpose of the scientific method? A. To make a guess in order to prove a hypothesis B. To provide a reliable answer

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3 years ago

According to the scheme below, How much energy is required to evaporate 54.06 g water (Molecular weight of water is 18.02 g/mol)

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Calculate the mass (in grams) of methylene bluecrystals that you must weigh in order to make 100.0mL of 1.25 × 10-5mol/L methyle

mario62 [17]

Answer: The mass of methylene blue that must be weighed is $3.99\times 10^{-4}g$

Explanation:

To calculate the mass of solute, we use the equation used to calculate the molarity of solution:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Molarity of solution = $1.25\times 10^{-5}M$

Molar mass of methylene blue = 319.85 g/mol

Volume of solution = 100.0 mL

Putting values in above equation, we get:

$1.25\times 10^{-5}M=\frac{\text{Mass of methylene blue}\times 1000}{319.85\times 100.0}\\\\\text{Mass of methylene blue}=\frac{1.25\times 10^{-5}\times 319.85\times 100.0}{1000}=3.99\times 10^{-4}g$

Hence, the mass of methylene blue that must be weighed is $3.99\times 10^{-4}g$

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3 years ago

Changes to the global climate could include _______.

frosja888 [35]

1. Answer is d. all of the above.

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2. Answer is c. ozone.

Trees release oxygen and water vapor into the atmosphere but not ozone. The oxygen gas is released by trees as the by-product of photosynthesis. This is the natural way of production of oxygen gas. Water vapor can be released due to the transpiration of trees.

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Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?

Dennis_Churaev [7]

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3 years ago

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