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3 years ago

An unknown gas has pressure, volume and temperature of 0.9 atm 8L and 120°C respectively. How many moles of gas are present?

Chemistry

1 answer:

Vanyuwa [196]3 years ago

8 0

Answer:

n = 0.223 mol.

Explanation:

Hello there!

In this case, according to the given information, it is possible for us to approach this problem via the ideal gas law, which involves the pressure, moles, temperature and volume of the gas:

$PV=nRT\\\\$

Thus, by solving for moles we obtain:

$n=\frac{PV}{RT}$

Therefore, we plug in the given volume, temperature (in Kelvins) and pressure to obtain:

$n=\frac{0.9atm*8L}{0.08206\frac{atm*L}{mol*K}*(120+273)K} \\\\n=0.223mol$

Best regards!

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Answer:

The number of atoms present in one unit of the following compounds is:

a). Potassium Iodide , KI = 2

b).Sodium Sulfide, $Na_{2}S$ = 3

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Explanation:

Atomicity : It is defined as the number of atoms that are present in a given molecule/compound.

Atom : The smallest unit of matter is called atom. For e.g O is atom of oxygen but $O_{2}$ is not an atom , it is molecule of oxygen .

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Similarly Na , K , Fe are atoms but $O_{2}$ , $CO_{2}$ , $N_{2}$ , $H_{2}$ are molecules

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b) Sodium Sulfide

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3 years ago

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azamat

Answer:

TRUE
FALSE
TRUE
FALSE
FALSE
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Explanation:

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Intermetallic compounds are usually hard and brittle : TRUE. because Intermetallic compounds prevents dislocation movements and this makes them brittle and hard
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Stoichiometric intermetallic compounds exist over a range of compositions : FALSE
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