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3 years ago

This type of nucleus is formed during a solar nuclear reaction by the fusion of four nuclei.

Chemistry

1 answer:

katovenus [111]3 years ago

5 0

a helium-4 nucleus is formed

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The amount of material left after two half-lives is one-half of the original amount. ____________________

Assoli18 [71]

I think it is true because that seems like the right answer

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3 years ago

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How many atoms are in 19.6 g of Sodium?

Hitman42 [59]

Answer:

Number of atoms = 5.1345 x 10²³

Explanation:

Given:

Mass of sodium = 19.6

Find:

Number of atoms

Computation:

We know that atomic mass of sodium is 22.98

So,

Number of atoms = [Mass of sodium/atomic mass of sodium]Avogadro's number

Number of atoms = [19.6 / 22.98]6.02 x 10²³

Number of atoms = 5.1345 x 10²³

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3 years ago

What is the mass, in grams, of 1.33 mol of water, H2O? Express the mass in grams to three significant figures.

puteri [66]

Answer:

I need point

Explanation:

I need point

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3 years ago

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NaCl has a Delta. Hfus = 30. 2 kJ/mol. What is the mass of a sample of NaCl that needs 732. 6 kJ of heat to melt completely? Use

tia_tia [17]

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

The heat of fusion has been the amount of heat required to convert 1 mole of substance into solid to liquid state.

The heat required has been given as:

$Q=m\Delta H$

<h3>Computation for the mass of NaCl</h3>

The given solution has heat of fusion, $\Delta H_{fus}=30.2\rm kJ/mol$

The heat required to melt the sample has been, $Q=732.6\;\rm kJ/mol$

Substituting the values for the mass of NaCl

$\rm 732.6\;kJ/mol=Mass\;\times\;30.2\;kJ/mol\\\\
Mass=\dfrac{732.6}{30.2}\;g\\\\
 Mass=24.3\;g\\$

The mass of NaCl sample has been 24.3 g. Thus, option A is correct.

Learn more about heat of fusion, here:

brainly.com/question/87248

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3 years ago

Is pyrophoric a chemical or physical property

Neporo4naja [7]

Answer:

Pyrophoricity is a property of metals and oxides of lower oxidation states, including radioactive ones, in which they spontaneously ignite during or after stabilization.

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3 years ago