Using the phase diagram for H20, which of the following correctly describes
water at 100°C and 1 atm pressure?
O A. Gas
B. At the melting point
C. At the boiling point
D. Liquid

Molar mass is the ratio of the mass to that of the moles of the substance present in the compound. The mass of the oxygen required for the complete combustion is 0.091 gm.

Mass is the quantity or the weight of the substance occupied in the reaction and is the product of the molar mass and the moles of the substance.

The reaction for the combustion of propane can be shown as:

[tex]\rm C_{3}H_{8} + 5O_{2} \rightarrow 3CO_{2} + 4H_{2}O[/tex]

Moles of propane can be calculated as:

[tex]\begin{aligned}\rm moles &=\rm \dfrac{mass}{molar\; mass}\\\\&= \dfrac{0.025}{44.1}\\\\&= 5.66\times 10^{-4}\end{aligned}[/tex]

The ratio of the number of moles of propane and oxygen is 1:5. So the moles of oxygen will be [tex]2.83 \times 10^{-3}\;\rm mol[/tex].

Mass of oxygen can be calculated as:

[tex]\begin{aligned}\rm mass &= \rm molar\;mass \times mass\\\\&= 2.83 \times 10^{-3}\;\rm mol \times 32 \;\rm g/mol\\\\&= 0.091\;\rm gm\end{aligned}[/tex]

Therefore, option D. 0.091 gm is the mass of oxygen.

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Explanation:

charged particles=8 which is proton and proton=no.of electron. That's why 8 particles are revolving round this center. And this atom structure is of oxygen

If the center of an atom has 8 charged particles that are protons as the neutrons are neutral there will be 8 negative charges that are electrons revolving around the center nucleus.

An atom is defined as the smallest unit of matter which forms an element. Every form of matter whether it is  solid,liquid or  gas consists of atoms . Each atom has a nucleus which is composed of protons and neutrons and shells in which the electrons revolve.

The protons are positively charged particles  and neutrons are neutral and hence the nucleus is positively charged. The electrons which revolve around the nucleus are negatively charged  particles and hence the atom as a whole is neutral and stable due to presence of oppositely charged particles.

Atoms of the same element are similar as they have number of sub- atomic particles which on combination do not alter the chemical properties of the substances.

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Explanation:

Neo mixes 600ml of black paint with white paint in order to get a gray paint. he think the colour came out too dark ,so that decreases the amount of black paint in the ratio 7:12. Calculate how much black paint it would be

Answer:true

Explanation:

because  its just true

Answer:

a, c, and d

Explanation:

Gamma rays, x-rays, an ultraviolet (UV) waves have more energy than visible light.

Answer:

Gamma rays, X - rays and ultraviolet ray

Explanation:

High energy waves have high frequency

Answer:

19.9 atoms

Explanation:

Grams --- Moles --- Atoms

You're converting from atoms (molecules) to moles.

You do not have to calculate the mass of "di phosphorus pentoxide."

Since you're already given 1.2x10^25 atoms, you start with that. You need to cancel out the atoms, so you need Avogadro's number as shown in the image.

(This has nothing to do with the problem) But in case if you're wondering, the "di" in phosphorus means there's 2 phosphorus and the "pent" means that there are 5 oxygens. So P2O5. Go to your periodic table, multiply their respective atomic masses. You would multiply phosphorus twice and oxygen 5 times. And add them up to get the overall mass.

I hope this helped!

Based on the Ka and Kb values of the reactants, the Kc value of the given reaction is greater than 1.

The acid dissociation constant, Ka, of HSO4- is 1.2 × 10^-2.

The base dissociation constant, Kb for CH3CO2- is 5.6 × 10^-10

The given equation of reaction is as follows:

Substituting the Ka and Kb values:

Kc = 1.2 × 10^-2/5.6 × 10^-10

Kc = 2.14 × 10^7

Therefore, the Kc value of the given reaction is greater than 1.

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The molecule C2H2 has resonance structures because it can be represented using four  Lewis structures.

Sometimes, a single Lewis struture does not suffice in eliucidation of the bonding properties of a molecule. In such cases, we have to invoke multiple structures called resonace structures.

The resonance structures of C2H2 are shown in the image attached. Hence we can see that the molecule can be represented using four  Lewis structures.

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Answer:

No resonance!

Explanation:

just did the activity <3

Answer:

Atom is the part of an element

Explanation:

A particular element is composed of only one type of atom

mol FeCl₂ = mass : molar mass = 507 : 127 = 3.992

mol NaCl = 2/1 x mol FeCl₂ = 2/1 x 3.992 = 7.984

mass NaCl = 7.984 x 58.5 = 467.06

closest to C. 467.52 g NaCl

507 g of FeCl₂ produced amount of NaCl is equal to 467.52 grams. Therefore, option (C) is correct.

The balanced chemical equation in which the number of atoms of each element is equal on either side of the chemical equation of the reaction.

The law of conservation of mass follows by a balancing of a chemical equation by which the total mass of the reactants must be equal to the total mass of the products.

Given, the balanced chemical reaction of iron (II) chloride and NaOH:

[tex]FeCl_2 + 2NaOH \longrightarrow Fe(OH)_2(s) + 2NaCl[/tex]

Given, the mass of the FeCl₂= 507 g

The molar mass of FeCl₂ and NaCl is 126.75 g/mol and 58.44 g/mol respectively.

126.75 g of FeCl₂ produced amount of NaCl = 2 × 58.44 g

507 g of FeCl₂ produced NaCl = (116.88/126.75) ×507 = 467.52 g

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Answer:

342

g/mol

Explanation:

Just get out that Periodic Table of the Elements, find the atomic masses for each atom, and add them up!

Credit to "SCooke" (User)

When there is 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl, and the pH mathematically given as

pH=4

The indicator is Methyl red

Generally, the equation for the  Chemical Reaction  is mathematically given as

HCl +BOH--->BCl+H20

Therefore

pH=0.5(pkw-pkb-logl)

pH=0.5()14-5.8-logl

pH=4

In conclusion, The best indicator should have pKa =pH

Hence

Methyl red is best

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The best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.

An acid-base indicator is a substance which change colour or develop turbidity at a particular pH.

Acid-base indicators are used during acid-base titrations to detect when neutralization has occured.

The indicators to be used when combining acid and base are as follows:

Morphine is a weak base while hydrochloric acid is a strong acid.

Therefore, the best indicator to use when titrating 0. 1M morphine (Kb = 1. 6 × 10-6) with 0. 3M HCl is methyl orange.

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Answer:

0.159 M (3 s.f.)

Explanation:

This is an acid- base reaction, which is also known as a neutralisation reaction.

[tex]\boxed{acid \: + base→salt \: + water}[/tex]

1) Write out the balanced chemical equation.

NaOH (aq) +HCl (aq) → NaCl (aq) +H₂O(l)

The equation is balanced as on each side of the equation, there is 1 Na atom, 1 O atom, 2 H atoms and 1 Cl atom.

2) Find the number of moles of NaOH.

The symbol 'M' denotes Molarity, which is the number of moles per litre.

From the given concentration of NaOH,

1 L NaOH ----- 0.450 mol NaOH

Convert 83.0mL to litres:

Volume of NaOH

= 83 ÷1000

= 0.083 L

Moles of NaOH

= 0.083 ×0.450

= 0.03735 mol

3) Find the number of moles of HCl.

From the balanced equation, 1 mole of HCl is needed to neutralize 1 mole of NaOH.

Thus, amount of HCl

= 0.03735 mol

4) Calculate the concentration of HCl

Concentration= mol/ volume

Converting the volume from mL to L,

235 mL= 0.235 L

Concentration of HCl

= 0.03735 ÷0.235

= 0.15894 mol/L (5 s.f.)

= 0.159 M (3 s.f.)

Answer:

sorry but can i get the question? cause it is not there

The equilibrium concentration of H2 and I2 is 0.165 M. The equilibrium concentration of HI is 1.17 M.

The term Kc refers to the equilibrium constant for a aqueous phase reaction. The concentrations of each specie is;

H2 = 1.5/2 = 0.75 M

I2 = 1.5/2  = 0.75 M

Setting up the ICE table;

        H2(g) +     I2(g) <---> 2HI(g)

I      0.75          0.75             0

C     -x                -x                 +2x

E    0.75 - x     0.75 - x           2x

Kc = [HI]^2/[H2] [I2]

57.85 = (2x)^2/(0.75 - x)^2

57.85(0.56 - 1.5x + x^2) = 4x^2

32.3 - 86.7x + 57.85x^2 = 4x^2

4x^2 - 57.85x^2 + 86.7x - 32.3 = 0

-53.85x^2 + 86.7x - 32.3 = 0

x = 0.585 M because x can not be greater than the initial concentration.

At equilibrium;

[HI] = 2x = 2(0.585) = 1.17 M

[H2] =[I2] = 0.75 M  - 0.585 M = 0.165 M

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Answer:

8.08 G/mol

Explanation:

This is because a mole just equals 1 amount of something. Example, 1 mol of carbon is about 12 AMU. To convert from Mols to Grams, you need to multiply the substance mass by the amount of mols, this case 2.02g/mol by 4.

Hope this helps!

Answer:

I dont km now this one at all sorry

Answer:

See below, please

Explanation:

Because the mole ratio

[tex] \frac{m(ch4)}{m(o2)} = \frac{1}{2} [/tex]

Now, at the beginning

Mole m(CH4) =4 mol, m(O2) = 5 mol

If O2 gas is fully reacted, used up,

Need m(CH4) = 2.5 mol

Hence, the mole of CH4 left

m(CH4) = 4-2.5=1.5 mol

That means

At the end of the reaction,

m(CH4) =1.5 mol

m(O2) = 0 mol

Answer:

Ans: 5.8g

Explanation:

31.35L * 1mol/22.4L * 4.00g/1mol = 5.81g

Answer:

the ball starts moving

the energy changes

The answer is  longitudinal waves

Answer:

The Temperature will Increase, and the fire will Blow

Explanation:

I hope I could help

Answer:

KI (potassium iodide) is a salt of stable (not radioactive) iodine that can help block radioactive iodine from being absorbed by the thyroid gland, thus protecting this gland from radiation injury. The thyroid gland is the part of the body that is most sensitive to radioactive iodine.

Happy To Help !!!

Answer:

Yes, there are some free resource like quiz..let quizzes to help guide you through your studying, so if you want just post the questions and I can answer them as well.

Answer:

An example of this is gasoline being put into our cars. With the help of the battery's energy, cause mechanical energy for the car to move faster amd longer than it would have lasted withut gas.

Explanation:

Answer:

both contains 6.02 x 1023 atoms

Explanation:

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Answer: 0.135 M

Explanation: