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3 years ago

A) How many grams of water are produced when 2.50 g of aluminum

Chemistry

1 answer:

egoroff_w [7]3 years ago

5 0

The correct answer is 13 I just did it bro

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Why do we use diagrams to explain the carbon cycle? (2 reasons)

netineya [11]

Answer:because carbon dioxide is recycled and used up again my plants and released by animals

Explanation:

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2 years ago

Suppose you had 1.0 mol samples the following gases at STP. If the volume of each of the samples of gas was reduced to one tenth

Leokris [45]

A.He
because He 's molecular weight is small than each other

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3 years ago

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Helium is the lightest noble gas and the second most abundant element (after hydrogen) in the universe. The mass of a helium−4 a

dmitriy555 [2]

Answer: The fraction of atom's mass contributed by nucleus is 0.99

Explanation:

Nucleons are defined as the sub-atomic particles which are present in the nucleus of an atom. Nucleons are protons and neutrons.

The isotopic symbol of Helium-4 atom is $_2^4\textrm{He}$

Number of electrons = 2

Number of protons = 2

Number of neutrons = 4 - 2 = 2

We are given:

Mass of He-4 atom = $6.64648\times 10^{-24}g$

Mass of 1 electron = $9.10939\times 10^{-28}g$

Calculating the mass contributed by the nucleus = $m_{He}-2(m_e)$

Mass of the nucleus of He-4 atom = $6.64648\times 10^{-24}-(2\times (9.10939\times 10^{-28}))=(6.64648-0.0018219)\times 10^{-24}=6.64466\times 10^{-24}$

To calculate the fraction of atom's mass contributed by the nucleus, we use the equation:

$\text{Fraction of atom's mass contributed by nucleus}=\frac{\text{Mass of nucleus}}{\text{Mass of atom}}$

Putting values in above equation, we get:

$\text{Fraction of atom's mass contributed by nucleus}=\frac{6.64466\times 10^{-24}g}{6.64648\times 10^{-24}g}=0.99$

Hence, the fraction of atom's mass contributed by nucleus is 0.99

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3 years ago

Damaged lungs are most sensitive to blank incurable diseases that can cause death

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This kind of damage occurs repeatedly, it may lead to permanent damage to your lungs that could cause a lower quality of life. Ozone may aggravate chronic lung diseases, such as emphysema and bronchitis. Scientists are concerned that repeated short-term damage from ozone exposure may permanently injure the lung

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3 years ago

Which statement defines activation energy?

Kisachek [45]

I believe that the best answer among the choices provided by the question is It is the difference between reactant energy and maximum energy.

Hope my answer would be a great help for you. If you have more questions feel free to ask here at Brainly.

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3 years ago

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