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8090 [49]
3 years ago
11

SELECT ALL THAT APPLY

Chemistry
2 answers:
Scilla [17]3 years ago
3 0
At STP conditions, 0.25 moles of CO2(g), H2(g), NH3(g)

The answers are:
<span>1. Will contain the same number of molecules </span>
3. Will occupy the same volume

koban [17]3 years ago
3 0

<u>Answer:</u> The correct answer is Option 1 and Option 3.

<u>Explanation:</u>

We are given:

0.25 moles of CO_2,H_2\text{ and }NH_3

STP conditions states that 1 mole of a gas occupies 22.4 L of volume.

The volume occupied by all the gases at STP will be 0.25\times 22.4=5.6L

According to mole concept: 1 mole of a compound contains 6.022\times 10^{23} number of molecules or 1 mole of an element contains 6.022\times 10^{23} number of atoms.

We know that the given gases are compounds. Thus, all the three gases will have 0.25\times 6.022\times 10^{23}=1.5055\times 10^{23} number of molecules.

Hence, the correct answer is Option 1 and Option 3.

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Una muestra de 1 gramo de un elemento contiene 1,5 x 1022 atomos, cual es su masa molar❓❓
marusya05 [52]

El número de Avogadro es 6,022 x 10^23, y es el número de átomos que hay en un mol de dicho elemento. A su vez un mol es la cantidad de un elemento cuya masa en gramos coincide con el peso atómico.

Por tanto, 6,022 x 10^23 átomos del elemento tienen una masa en gramos igual a su peso atómico. Hacemos una regla de tres:


1 gramo -------- 1,5 x 10^22 átomos

x ------------------ 6,022 x 10^23 átomos


=> x = 40,1 gramos por mol del elemento.


De modo que su peso atómico es 40,1. Se trata del calcio.


Saludos.

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3 years ago
HELP THIS IS FOR CHEM!! If the pull force is 898N and the friction force is 335N what is the net force?
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