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Olenka [21]
3 years ago
5

Which statements describe an element? Check all that apply.

Chemistry
2 answers:
Tems11 [23]3 years ago
8 0

Answer:

A,B,E

Explanation:

A) Elements can't be physically separated.

B) Elements are indeed made of only one type of atom

E) Elements cannot be broken down into a simpler form, at least not without a ton of energy being released as an explosion :)

Sav [38]3 years ago
8 0

Answer:

A,B,E

Explanation:

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An unknown noble gas has a density of 5.84 g dm-3 at STP. Calculate its molar mass, and so identify the gas.
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The noble gas is Xenon and its molar mass is 131 g/mol.

<h3>What is the molar mass of the noble gas?</h3>

The molar mass of the noble gas is determined as follows;

Let molar mass of unknown gas be M, and mass of gas be m

Density of the noble gas, ρ = 5.8 g/dm³

density = m/V

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From ideal gas equation:

PV = nRT

where n = m/M

PV = mRT/M

M = mRT/PV

M =  0.0821 * 273.15 * 5.84/1

Molar mass of the noble gas = 131 g/mol

The noble gas is Xenon which has molar mass approximately equal to 131 g/mol.

Learn more about molar mass at: brainly.com/question/837939

#SPJ1

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