Please help me answer this question:(

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

[tex]volume = \frac{mass}{density} \\ [/tex]

From the question we have

[tex]volume = \frac{65}{5.45} \\ = 11.926605...[/tex]

We have the final answer as

Hope this helps you

The molar mass of the unknown gas in the 500 mL flask at stp is 89.7 g/mol

We'll begin by calculating the number of mole of the gas that occupied 500 mL at stp.

Recall at stp:

22400 mL = 1 mole of the gas

Therefore,

500 mL = 500 / 22400 = 0.0223 mole of gas.

Finally, we shall determine the molar mass of the gas. This can be obtained as follow:

Mass of gas = 2 g

Mole of gas = 0.0223 mole

Molar mass = mass / mole

Molar mass of gas = 2 / 0.0223

Therefore, the molar mass of the unknown gas is 89.7 g/mol

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Answer:

Covalent compound

Explanation:

It is formed by covalent bonds, in which the atoms share a pair of valence electrons

Answer:

[N₂O₄] = 0.00411 M

[NO₂] = 0.0918 M

Explanation:

In the reaction of: N₂O₄(g) ⇌ 2 NO₂(g) If the equilibrium constant is Kc = 0.513 and the initial concentration of N₂O₄ = 0.0500 M. What are the equilibrium concentrations of N₂O₄ and NO₂ under these conditions?

Step 1: Given data

Initial concentration of N₂O₄: 0.0500 M

Equilibrium constant (Kc): 0.513

Step 2: Make an ICE chart

        N₂O₄(g) ⇌ 2 NO₂(g)

I        0.0500           0

C           -x              +2x

E      0.0500-x        2x

Step 3: Find the value of "x"

The equilibrium constant is:

Kc = [NO₂]² / [N₂O₄]

0.513 = (2x)² / (0.0500-x)

4x² + 0.513 x -0.02565

We solve for x and we get x₁ = 0.0458942 and x₂ = −0.558894 (neglected).

Step 4: Calculate the concentrations at equilibrium

[N₂O₄] = 0.0500-x = 0.00411 M

[NO₂] = 2x = 0.0918 M

Answer:

A is not true.

Blue waves have ~500 nm and Orange waves have ~625 nm

Answer:

forensic scientist

Explanation:

forensic science is the discipline in which professionals use scientific means to analyze physical crime evidence. this evidence is then presented in court in order to help determine the innocence or guilt of a specific suspect.

Answer:

Its a forensic scientist :D

Explanation:

I took a test and got it wrong but it showed the right answer and its a forensic scientist

(don't ask how i got it wrong i was rushing!!)

Answer: b

Explanation:

Answer:A

Explanation:

Answer:

volume

Explanation:

Answer: concetration

Explanation:

Answer:

Molecular equation: BaCl₂(aq) + Na₂CO₃(aq) ---> BaCO₃(s) + 2NaCl(aq)

Complete ionic equation: Ba²⁺(aq) + 2Cl⁻ + 2Na⁺(aq) + CO₃²⁻(aq) ---> BaCO₃(s)  + 2Na⁺(aq) + 2Cl⁻(aq)

Net Ionic equation: Ba²⁺(aq) + CO₃²⁻(aq) ---> BaCO₃(s)

Molecular equation: 2KOH(aq) + H₂SO₄(aq) ---> K₂SO₄(aq) + 2H₂O(l)

Complete ionic equation: 2K⁺(aq) + 2OH⁻(aq) + 2H⁺(aq) + SO₄²⁻(aq) ---> 2K⁺(aq) + SO₄²⁻(aq) + 2H₂O(l)

Net ionic equation: 2OH⁻(aq) + 2H⁺(aq) ---> 2H₂O(l)

Explanation:

The reaction that occurs when aqueous solutions of BaCl₂ and Na₂CO₃ are mixed together to produce a white solid is known as a double displacement reaction.

Molecular equation: BaCl₂(aq) + Na₂CO₃(aq) ---> BaCO₃(s) + 2NaCl(aq)

Complete ionic equation: Ba²⁺(aq) + 2Cl⁻ + 2Na⁺(aq) + CO₃²⁻(aq) ---> BaCO₃(s)  + 2Na⁺(aq) + 2Cl⁻(aq)

Net Ionic equation: Ba²⁺(aq) + CO₃²⁻(aq) ---> BaCO₃(s)

The reaction between aqueous solutions of KOH and H₂SO₄ is a neutralization reaction.

Molecular equation: 2KOH(aq) + H₂SO₄(aq) ---> K₂SO₄(aq) + 2H₂O(l)

Complete ionic equation: 2K⁺(aq) + 2OH⁻(aq) + 2H⁺(aq) + SO₄²⁻(aq) ---> 2K⁺(aq) + SO₄²⁻(aq) + 2H₂O(l)

Net ionic equation: 2OH⁻(aq) + 2H⁺(aq) ---> 2H₂O(l)

Answer:

Concentration of dissolved salts = 34,038.76 ppm

Explanation:

Given:

Salinity of ocean water = 34

Find:

Concentration of dissolved salts

Computation:

Salinity of ocean water = 34 g/l

1g/l = 1001.14 ppm

Concentration of dissolved salts = 1001.14 ppm x 34

Concentration of dissolved salts = 34,038.76 ppm

Hi , I’m really sorry because I just have the first question... so here it is :

So it is 0.52 mol .

Have a nice day .

molecule(s)

two or more atoms touching means they are connected as molecules which also make up compounds

Answer:

opposite

Explanation:

Answer:

opposite

Explanation:

cu9c9ucoucucpucfpufupfpucupvpjvpucu

Answer:Glucose, Oxygen and Water

Explanation:

Answer:

Hello i have don this... : )

Explanation:

It is oxygen and glucose

Have a good day im 100% sure this is... i forgot but it is before or after the asexual and sexual lessons

I added a meme for no reason you will only get it if you have read heroes of Olympus

Answer:

68.48%

Explanation:

The percent mass of an element in a compound tells us about the amount of such element contributed to the total compound.

In this case, 7.28 g sample of chromium metal was heated to produce chromium oxide with weight of 10.63 g. The percent mass of chromium in chromium oxide can be calculated by using the formula:

%mass of Cr = mass of Cr/mass of Chromium oxide × 100%

%mass of Cr = 7.28/10.63 × 100

%mass of Cr = 0.6848 × 100

%mass of Cr = 68.48%

Answer:

Yes

Explanation:

Answer:

[tex]V=247L[/tex]

Explanation:

Hello there!

In this case, since the density is defined as the degree of compactness of a substance and is computed by diving the mass over the volume it occupies:

[tex]\rho =\frac{m}{V}[/tex]

Given the density and the mass of the neon, we can compute its density as shown below:

[tex]V=\frac{m}{\rho} =\frac{222g}{0.900g/L}\\\\V=247L[/tex]

Best regards!

The volume of neon in liters is 246.67 L.

To calculate the volume of neon, we use the formula below.

Formula:

Where:

make V the subject of the equation.

From the question,

Given:

Substitute these values into equation 2

Hence, The volume of neon in liters is 246.67 L.

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Answer: C

Explanation:

Electrical conductivity

Answer:

Pb²⁺(aq) --> Ni²⁺(aq)

Explanation:

The equation of the reaction is given as;

Ni(s) + Pb(NO₃)₂(aq) --> Pb(s) + Ni(NO₃)₂(aq)

In writing the ionic equation, we break the aqueous compound into ions. The solid and liquid compounds are ignored.

We have;

Pb²⁺(aq)  + NO₃²⁻(aq) -->  Ni²⁺(aq)  + NO₃²⁻(aq)

Canceling the spectator ions;

Pb²⁺(aq) --> Ni²⁺(aq)

Answer:

Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)

Explanation:

The complete ionic equation of this reaction is

Ni(s)+Pb2+(aq)+2 NO−3(aq)→Ni2+(aq)+2 NO−3(aq)+Pb(s)

The nitrate ions are spectator ions and can be removed from the equation, giving us

Ni(s)+Pb2+(aq)→Ni2+(aq)+Pb(s)

Answer:

D

Explanation:

Light blubs are not made of fire.

The sun wasnt made by humans.

You cant find Light bulbs in nature.

Meaning it is D.

Answer:

Well the answer of 1 and 3 is WRONG based on the 1 star review and the answer of 3 is wrong too I just took a test with this question.

Explanation:

Sorry...

Answer:

it's 6

Explanation:

I just took the test and got it right

Answer:

C.

Explanation:

MoleculesHcl = (1 molMgO/1)(2molHCL/1molMGO)(6.02x10^23/1molHCL) = 1.204x10^24