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3 years ago

The number of protons in every atom of an element

2 answers:

8 0

It is 36
because the the atomic number is the number of protons is an atom of element. in an example, kryptons atomic number is 36. this tells us that an atom if krypton has 36 protons in its nucleus. the interesting thing here is that every atom of krypton contains 36 protons.

Margarita [4]3 years ago

6 0

Answer:

The *atomic* number

Explanation:

The atomic number is the number of protons in an atom of an element.

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5. A 5.00 g sample of an unknown substance was heated from 25.2 C to 55.1 degrees * C , and it required 133 to do so. Identify t

Leviafan [203]

Answer:

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Explanation:

Given

$T_1 = 25.2^oC$

$T_2 = 55.1^oC$

$m = 5.00g$

$\triangle Q= 133J$

<em>See attachment for chart</em>

Required

Identify the unknown substance

To do this, we simply calculate the specific heat capacity from the given parameters using:

$c = \frac{\triangle Q}{m\triangle T}$

This gives:

$c = \frac{\triangle Q}{m(T_2 - T_1)}$

So, we have:

$c = \frac{133J}{5.00g * (55.1C - 25.2C)}$

$c = \frac{133J}{5.00g * 29.9C}$

$c = \frac{133J}{149.5gC}$

$c = 0.89\ J/gC$

From the attached chart, we have:

$Al(s) = 0.89\ J/gC$ --- The specific heat capacity of Aluminum

<em>Hence, the unknown substance is Aluminum</em>

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