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3 years ago

One mole is equal to how many particles

Chemistry

1 answer:

Ugo [173]3 years ago

4 0

One mole is equal to 6.02*10^23 particles~

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Which of the following reactions are redox reactions? 4Li(s)+O2(g)→2Li2O(s) Zn(s)+Cu2+(aq)→Zn2+(aq)+Cu(s) Sr(NO3)2(aq)+Na2SO4(aq

Lapatulllka [165]

Answer:

As2O3 → H3AsO4

As2O3 → 2H3AsO4 balance As

5H2O + As2O3 → 2H3AsO4 balance O by adding H2O to one side

5H2O + As2O3 → 2H3AsO4 + 4H+ balance H by adding H+ to one side

5H2O + As2O3 → 2H3AsO4 + 4 H+ + 4e- balance charge by adding electrons to one side

Now do the same for the other part of the reaction

NO3- → NO

NO3- → NO + 2H2O

4H+ + NO3- → NO + 2H2O

3e- + 4H+ + NO3- → NO + 2H2O

Now cancel the electrons by multiplying the first equation by 3 and the second equation by 4, then add them together .

3As2O3 + 4NO3- + 7H2O + 4H+ → 6H3AsO4 + 4NO

4 0

3 years ago

Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

just olya [345]

Answer:

30.0g/mol

Explanation:

Step 1: Given data

Mass of the gas: 0.125 g

Pressure (P): 1 atm (standard pressure)

Temperature (T): 273.15 K (standard temperature)

Volume (V): 93.3 mL

Step 2: Calculate the moles of the gas

We will use the ideal gas equation.

$P \times V = n \times R \times T\\n = \frac{P \times V}{R \times T} = \frac{1atm \times 0.0933L}{\frac{0.0821atm.L}{mol.K} \times 273.15K} = 4.16 \times 10^{-3} mol$

Step 3: Calculate the molar mass of the gas

4.16 × 10⁻³ moles correspond to a mass of 0.125 g. The molar mass of the gas is:

$\frac{0.125g}{4.16 \times 10^{-3} mol} =30.0g/mol$

7 0

3 years ago

How many moles are equal to 83.4 L of O2?

ladessa [460]

Answer:

$3.72mol$

Explanation:

Hello,

In this case, we consider that at STP conditions (273 K and 1 atm) we know that the volume of 1 mole of a gas is 22.4 L, thereby, for 83.4 L, the resulting moles are:

$22.4L\rightarrow 1mol\\83.4L\rightarrow X\\X=\frac{83.4L*1mol}{22.4L}=3.72mol$

This is a case in which we apply the Avogadro's law which relates the volume and the moles as a directly proportional relationship.

Best regards.

8 0

3 years ago

I NEED HELP ASAP PLZ LOOK AT THE PICTURE CAREFULLY!!!!

Virty [35]

Answer:

it is a little fuzzy

Explanation:

6 0

2 years ago

PLeas Answer with A B C or D please be QUICK :>

Lena [83]

<em>Answer: </em>D

<em>Explanation:</em>

chemical formula of methane: CH4

electron configuration of C: 2,4

electron configuration of H: 1

there are 4 hydrogen atoms that donated 1 electron each to C

therefore it's D.

3 0

2 years ago