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Oliga [24]
3 years ago
5

What does 4_2 helium means

Physics
1 answer:
oksian1 [2.3K]3 years ago
4 0
I believe you're asking about Helium with two numbers to the left of it.

Once number is on top of the other.

The 4, which is on top, represents the atomic mass. Helium's atomic mass is 4.

The 2, which is on bottom, represents the number of protons (or atomic number). Helium's number of protons is 2.
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inn [45]
You need an additional point of data here: the enthalpy of fusion, or conversely the enthalpy of melting (they differ only by their sign). For water (or ice) that value is gotten from sources such as the internet

<span>ΔH°(fus) = 6.01 kJ/mole </span>

<span>Since you have 35 000g, how many moles do you have? </span>
<span>Moles H2O = 35000 g/(18.015 g/mole) = 1942.8 moles</span>

<span>So, take that ΔH°(fus) in kJ/mole, multiply by the number of moles, and there ya go! 
</span>
6.01 x 1942.8 = 11,676 kJ of energy is released

Hope I helped!! xx
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hammer [34]

Answer: Here's your answer friend,

Explanation:

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