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3 years ago

8. __ and _ are located in the nucleus.

Chemistry

1 answer:

aliina [53]3 years ago

7 0

Answer:

protons and neutrons are located in the nucleus.

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Mass is:

amm1812

Measured in kilograms

3 0

4 years ago

How many moles of H2 are needed to produce 18 moles NH3 in the reaction below?

Sophie [7]

Answer:

27 moles of H₂

Explanation:

Equation of reaction:

N₂ + 3H₂ → 2NH₃

From the equation of reaction,

3 moles of H₂ is required to produce 2 moles of NH₃

3 moles H₂ = 2 moles of NH₃

X moles of H₂ = 18 moles of NH₃

X = (3 * 18) / 2

X = 27 moles of H₂

27 moles of H₂ is required to produce 18 moles of NH₃

4 0

4 years ago

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

8 0

3 years ago

A sample of ch4o with a mass of 32.0 g contains ________ molecules of ch4o.

ValentinkaMS [17]

6.02 times 10 to the 23 power, which is Avogadros number

3 0

4 years ago

The curiosity is important in the progress of science because it

nordsb [41]

It it important because it makes people wonder how things work and are made which makes it so they want to move forward with experiments

3 0

4 years ago

Read 2 more answers

8. ______________ and _____________ are located in the nucleus.

8. __ and _ are located in the nucleus.