Calculate the mass of 25,000 molecules of nitrogen gas. (1 mole = 6.02 x 1023 molecules)

Answers

Answer 1

Answer:

Answer: $116.2* 10^(-26)$ grams

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023* 10^(23)$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text {Given molecules}}{\text {Avogadros number}}$

$\text{Number of moles}=(25000)/(6.023* 10^(23))=4.15* 10^(-26)moles$

Now 1 mole of $N_2$ gas weighs = 28 grams

$4.15* 10^(-26)moles$ of $N_2$ gas weighs = $(28)/(1)* 4.15* 10^(-26)=116.2* 10^(-26)$ grams

Thus the mass will be $116.2* 10^(-26)$ grams.

Answer 2

Answer:

Hey there!

Molar mass N2 = 28.01 g/mol

Therefore:

28.01 g N2 -------------- 6.02*10²² molecules N2

( mass N2 ?? ) ----------- 25,000 molecules N2

mass N2 = ( 25,000 * 28.01 ) / ( 6.02*10²³ )

mass N2 = 700250 / 6.02*10²³

mass N2 = 1.163*10⁻¹⁸ g

Hope that helps!

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A chemistry student is recording the electric charges of some atoms. Use the results in the chart to answer the following questions.Atom Electric Charge
Carbon −4
Nitrogen +5
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Write an equation to find the difference in electric charge between the Nitrogen atom and the Oxygen atom.

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Using the equation you wrote in Part A, what is the difference in electric charge between the two atoms?

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Answer Can someone here please look at my questions and see if you can help

The components in a mixture do not combine chemically true or false?

Answers

True
A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties

What is the difference in the beginning between primary succession and secondary succession?a. secondary succession has water
b. secondary succession has soil
c. primary succession has soil
d. primary succession has water

Answers

Option B. secondary succession has soil

What net ionic equation describes the reaction when these solutions are mixed?Given the equation: Na3PO4 (aq) + CaCl2(aq) →

A. 2PO43–(aq) + Cl– (aq) → Cl2(PO4)3(s)
B. 2Ca2+(aq) + Na+(aq) → NaCa2(s)
C. Na+(aq) + Cl– (aq) → NaCl(s)
D. 2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)

Answers

I think the correct answer from the choices listed above is option D. The net ionic equation that will describe the reaction of the reactants when mixed is expressed as:

2PO43–(aq) + 3Ca2+(aq) → Ca3(PO4)2(s)

Hope this answers the question. Have a nice day.

Answer:

$2PO_(4)^(-3) (aq) + 3Ca^(+2)(aq)-->Ca_(3)(PO_(4))_(2)(s)$

Explanation:

In net ionic equation we remove the spectator ions. The ions which are present on both the side and are not forming any solid compound.

Let us write the balanced reaction first:

$2Na_(3)PO_(4)(aq)+3CaCl_(2)(aq)-->3Ca_(3)(PO_(4))_(2)+6NaCl(aq)$

The ionic reaction is:

$6Na^(+)(aq)++6Cl^(-)(aq)+2PO_(4)^(-3) (aq) + 3Ca^(+2)(aq)-->Ca_(3)(PO_(4))_(2)(s)+6Na^(+)(aq)+6Cl^(-)(aq)$

Thus net ionic reaction is

$2PO_(4)^(-3) (aq) + 3Ca^(+2)(aq)-->Ca_(3)(PO_(4))_(2)(s)$

Consider two equal-volume flasks of gas at the same temperature and pressure. One gas, oxygen, has a molecular mass of 32. The other gas, nitrogen, has a molecular mass of 28. What is the ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks

Answers

Answer: The ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks is 1: 1

Explanation:

According to avogadro's law, equal volumes of all gases at same temperature and pressure have equal number of moles.

According to avogadro's law, 1 mole of every substance contains avogadro's number $6.023* 10^(23)$ of particles.

Thus as oxygen and nitrogen are at same temperature and pressure and are in equal volume flasks , they have same number of moles and thus have same number of molecules.

The ratio of the number of oxygen molecules to the number of nitrogen molecules in these flasks is 1: 1

Final answer:

The ratio of the number of oxygen molecules to the number of nitrogen molecules in the two flasks is 8/7.

Explanation:

The ratio of the number of oxygen molecules to the number of nitrogen molecules in the two flasks can be determined using Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules. Since both flasks have the same volume, temperature, and pressure, the ratio of oxygen molecules to nitrogen molecules will be equal to the ratio of their molecular masses.

The molecular mass of oxygen is 32, while the molecular mass of nitrogen is 28. Therefore, the ratio of the number of oxygen molecules to the number of nitrogen molecules will be:

32/28, or 8/7.

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What is the mass percent of sodium in NaCl?

Answers

The mass percent of sodium in NaCl can be determined by dividing the mass of sodium by the total mass of the compound (NaCl), then multiplying the result by 100. So, 39.34% of the mass of sodium in NaCl is composed of sodium.

The molecular weight of chlorine (Cl) is 35.45 g/mol while that of sodium (Na) is 22.99 g/mol.

The molecular weight of NaCl is calculated as follows:

Na: 1 atom * 22.99 g/mol = 22.99 g/mol
Cl: 1 atom * 35.45 g/mol = 35.45 g/mol

Total molecular weight = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

To determine the sodium mass percent in NaCl:

(mass of sodium / total mass of NaCl) * 100 to get the mass percent of sodium.

(22.99 g/mol / 58.44 g/mol) x 100 = 39.34% sodium mass percent

As a result, 39.34% of the mass of sodium in NaCl is composed of sodium.

Learn more about Mass percent, here:

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mass percent of sodium is mass of sodium divided by total mass of NaCl then multiplied by 100%. That means that percent mass equals (23g/58.45g)×100% which equals 39.3%.
Therefore the percent mass of sodium in NaCl is 39.3%
I hope this helps. Let me know if anything is unclear.

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