2 years ago

Determine the number of atoms in 3.54 mol Mn.

Chemistry

1 answer:

Anarel [89]2 years ago

3 0

2.13x10^24 is the answer.

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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:

Aluminum

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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2 years ago

Which of the following species cannot act as a Lewis base?

gayaneshka [121]

Answer:

NH4+

Explanation:

A Lewis base is a substance with the ability to share or give pairs of electrons.

The NH4 + ammonium ion donates a proton, therefore the ammonium ion is a Lewis acid.

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3 years ago

Which statement accurately describes the molecule Br2?

Zinaida [17]

there are no choices of statements

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3 years ago

Butter melt when you heat it in a pan on the stove. Is this a chemical change or physical change? How can you tell?

choli [55]

It would be an physical change ; if you melt butter the butter goes from a solid to a liquid so therefore the physical state is changed.

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2 years ago

What is it called when a substance changes from a vapor to a liquid

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The answer is CONDENSATION.

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