Find the mole fraction of Methanol CH3OH and water in a solution prepared by dissolving 4.5 g of alcohol in 40 g of H2O.

Answer:

Explanation:

Calculate the pH of a hydrochloride acid solution, HCl, whose hydronium ion (H3O)+ concentration is 8.29 X 10-4 M.

Note: answer should have three significant figures

Answer:

Explanation:

pls brainlest meh

Answer:

40 kcal

Explanation:

Heat required to melt

1 g

of ice at

0°C

is approximately

80 cal

. This is also called latent heat of fusion of ice.

For

500 g

of ice

Q

=

500

g

×

80

cal

g

=

40000 cal = 40 kcal

Answer:

Explanation:

Whenever you see molar masses in gas law questions, more often than not density will be involved. This question is no different. To solve this, however, we will first need to play with the combined ideal gas equation PV=nRT to make it work for density and molar mass. The derivation is simple but for the sake of time and space, I will skip it. Hence, just take my word for it that you will end up with the equation:M=dRTPM = molar mass (g/mol)d = density (g/L)R = Ideal Gas Constant (≈0.0821atm⋅Lmol⋅K) T = Temperature (In Kelvin) P = Pressure (atm)As an aside, note that because calculations with this equation involve molar mass, this is the only variation of the ideal gas law in which the identity of the gas plays a role in your calculations. Just something to take note of. Back to the problem: Now, looking back at what we're given, we will need to make some unit conversions to ensure everything matches the dimensions required by the equation:T=35oC+273.15= 308.15 KV=300mL⋅1000mL1L= 0.300 LP=789mmHg⋅1atm760mmHg= 1.038 atmSo, we have almost everything we need to simply plug into the equation. The last thing we need is density. How do we find density? Notice we're given the mass of the sample (0.622 g). All we need to do is divide this by volume, and we have density:d=0.622g0.300L= 2.073 g/LNow, we can plug in everything. When you punch the numbers into your calculator, however, make sure you use the stored values you got from the actual conversions, and not the rounded ones. This will help you ensure accuracy.M=dRTP=(2.073)(0.0821)(308.15)1.038= 51 g/molRounded to 2 significant figuresNow if you were asked to identify which element this is based on your calculation, your best bet would probably be Vandium (molar mass 50.94 g/mol). Hope that helped :) 

[tex]\qquad\qquad\huge\underline{{\sf Answer}}♨[/tex]

The ion had 4+ charge when it had 86 electrons, so it should have no charge on it if there are 4 more electrons and the atom will be neutral.

And since we know that number of electrons in a neutral atom is equal to Atomic Number of that atom.

So, at neutral phase, it had 86 + 4 = 90 electrons

hence, our required atom is : Thorium

And it's ion will be ~[tex]\sf Th^{4+} [/tex]

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Answer:

4.002602

Explanation:

the average that reflects the typical ratio of natural abundances of its isotopes.

The weight of 5 helium atoms in grams is 20.01301 grams.

Atoms are defined as the smallest unit into which matter can divided without the release of electrically charged particles.

It is also defined as a building block of matter and were discovered after big bang theory.  It is a fundamental piece of matter.

The weight of 1 helium atom = 4.002602 g

So, the weight of 5 helium atom = 4.002602 x 5

                                                      = 20.01301 g

Thus, the weight of 5 helium atoms in grams is 20.01301 grams.

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The property of liquid that create meniscus in glass tubes is Adhesion

Adhesion is the property of liquid in which two different or disimillar molecules or surfaces to cling to each other. For example, solids have a very high cohesive properties and this make them not to stick to the surfaces they come in contact.

Therefore, Adhesion property of liquids creates a meniscus in glass tube.

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Answer:

Adhesion

Explanation:

Answer:

option no b is right answer

Answer:

b

Explanation:

Answer:

A

Explanation:

the enzyme is substrate specifix coz of this trait

Answer:

erosion, weathering, dissolution, precipitation, and lithification So,D.weathering and erosion followed by compaction

Explanation:

mark me brainliest!!

Answer:

three half-filled orbitals

Answer:

6p

Explanation:

It can hold a total of 6

Answer:

I don't know but I'm curious now

Answer: To melt 500 g of ice, 4000 joule of heat is required.

Explanation:

I love the helps

The energy required to melt one gram of ice is 334 J. Then the heat energy required to melt 500 g of ice into water is 1.6 × 10⁵ J.

The change in energy associated with a phase change or any chemical reaction is called enthalpy change. Then, heat energy required to melt or freeze the substance.

The heat of fusion of ice is 334 J/g. Therefore, the heat energy required to melt the 1 g of ice is 334 J. Now the equation being used to  find the energy for m g of ice to melt is:

q = mHf.

Hf = 334J/g

m = 500 g

q = 500 × 334 J/g = 1.6 × 10⁵ J

Therefore, the heat energy needed to melt 500 g of ice to water is 1.6× 10⁵ J.

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Given the Planck's constant and the speed of light, the energy of the ultraviolet light with a frequency of 9.58×10¹⁴ Hz is 6.35×10¯¹⁹ J (Option C)

The energy of the ultraviolet light can be obtained as follow:

E = hf

E = 6.626×10¯³⁴ × 9.58×10¹⁴

E = 6.35×10¯¹⁹ J

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A solution has a pH of 5.4, the determination of [H+].

Take negative to other side

-pH = log H+

multiple Antilog on both side

(Antilog and log cancel each other )

Antilog (-pH) = [ H+ ]

New Formula :- Antilog (-pH) = [+H]

Now put the values of pH in new formula

Antilog (-5.4) = [+H]

we can write -5.4 as (-6+0.6) just to solve Antilog

Antilog ( -6+0.6 ) = [+H]

Antilog (-6) × Antilog (0.6) = [+H]

[tex]Antilog (-6) = {10}^{ - 6} , \\ Antilog (0.6) = 4 [/tex]

put the value in equation

[tex] {10}^{ - 6} \times 4 = [H+] \\ 4 \times {10}^{ - 6} = [H+][/tex]

Answer:It’s important to know WHY. Great explanations are what makes Brainly awesomeExplain everything. Imagine that the person who was asking, knows nothing at all so you need to start from the very beginningAlways include the steps and/or background required to get to the final answer. Let’s help other people understand and solve future problems on their ownShow all the calculation if it is a numerical question.

Explanation:

Answer:

A mol (approximately)represents the number 6.02 X 10^^23. Mols become useful when we learn that, for any element on the periodic table, 6.02 X 10^^23 atoms of that element have a mass equal to the atomic mass in grams. So, on the periodic table carbon has an atomic mass of 12.011. That means: 12.011 grams of carbon is made up of 6.02 X 10^^23 atoms.

The above question is tricky.

If the question considers 1 molecule of SO2 as a particle, then the answer is 1.80 * 6.02 X 10^^23

If the question considers the S as one particle, and the O2 as 2 more particles, then the answer is: 3 * 1.8 * 6.02 X 10^^23.

Explanation:

hope it helps U

With an Ag concentration of 0.020 M and a Pb2+ concentration of

0.0010 M, Only PbSO4(s) will precipitate,

Option C is correct

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

Ag2SO4--->2Ag++SO4^{-2}

Where

PbSO4--->Pb2+ +SO4^{-2}

Therefore

Ag2SO4=[0.02^2[0.001]]

Ag2SO4=4*10^{-7}

and

PbSO4=[0.001^2[0.001]]

PbSO4=4*10^{-6}

In conclusion,Since PbSO4>>PAg2SO4, Only PbSO4(s) will precipitate.

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The statement 'when charges pass through the bulb, light is produced' best describes how the charges move through the bulb.

An electrical charge is a type of positive or negative charge of the particles that move in a conductor.

At the atomic level, protons are positively charged particles, electrons are negative, and neutrons do not have a charge.

The electrical charges depend on the charge's initial time, the final time, and the net outward current.

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Fruits don't taste sour because of less hydrogen ions and less acid.

Scientists discovered that pulp from sour fruit contains more hydrogen ions, which leads sour taste while on the other hand, the sweeter fruit-like pineapples has pulp that contains fewer hydrogen ions, leading to less acidic and sweeter in taste.

So we can conclude that fruits don't taste sour because of less hydrogen ions and less acid.

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Answer:

NO + O2 NO2

Explanation:

The volume of the NaOH used is calculated as 14 mL.

The term stoichiometry has to do with the calculation of the amount of substance in a reaction using mass - mole or mass - volume relationship.

Here;

Number of  moles of CaCO3 = 0.205 g/100.1 = 0.00205 moles

Number of  moles of HCl = 2.00 M * 7/1000 L = 0.014 moles

2 moles of HCl reacts with 1 mole of CaCO3

x moles of HCl reacts with 0.00205 moles of CaCO3

x = 0.00205 moles * 2/1 = 0.0041 moles

Hence HCl is the excess reactant

Amount of excess HCl =  0.014 moles -  0.0041 moles = 0.0099 moles

Concentration of excess HCl reacted = 0.0099 moles/125 * 10^-3 = 0.0792 M

Using;

CAVA/CBVB = NA/NB

CAVANB = CBVBNA

VB = CAVANB/CBNA

VB = 0.0792 M * 10 mL * 1/ 0.058 M

VB = 14 mL

Missing parts;

A 0.205 g sample of caco3 (mr = 100.1 g/mol) is added to a flask along with 7.50 ml of 2.00 m hcl. caco3(aq) + 2hcl(aq) → cacl2(aq) + h2o(l) + co2(g) enough water is then added to make a 125.0 ml solution. a 10.00 ml aliquot of this solution is taken and titrated with 0.058 m naoh. naoh(aq) + hcl(aq) → h2o(l) + nacl(aq) how many ml of naoh are used?

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Answer:

294 moles of P

Explanation:

For every 1 mol of P4O10 contains 4 mol of P

so;

73.5 mol P4O10 × 4 mol P

1 mol P4O10

= 73.5 × 4

= 294 moles of P

73.5 mol of [tex]P_4O_{10}[/tex] contains 294 moles of P. In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.

The International System of Units (SI) uses the mole (abbreviated as mol) as its basic unit to measure the amount of a substance. It is mostly used in chemistry and is defined as the volume of a substance that contains exactly 12 grammes of pure carbon-12 in terms of atoms (or equivalent amounts of molecules, ions, or particles). The fundamental notion that atoms combine in whole-number ratios to form compounds serves as the foundation for the concept of the mole. It makes it simple for scientists to convert between a substance's mass and the quantity of atoms or molecules it contains.

In 1 mole of [tex]P_4O_{10}[/tex], there are 4 moles of P.

=4 × 73.5 moles of P.

= 294 moles of P

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The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

Given data :

Volume of solution to be tested for I-ion = 10 mL

Volume of  Pb(NO₃)₂ = 0.2 mL

molarity of Pb(NO₃)₂ = 0.13 M

First step : calculate conc of PB²⁺ ions in the solution

conc of PB²⁺ ions =  ( molarity of Pb(NO₃)₂ * volume of  Pb(NO₃)₂ ) / ( total volume )

                              = ( 0.13 * 0.2 ) / ( 10 + 0.2 )

                              = ( 0.026 ) / ( 10.2 )  = 0.002549 M

Next step : determine the molarity of  I

using the dissociation reaction of PbI₂

PbI₂(s) ---> Pb²⁺ (aq)  + 2I (aq)

also;  Ksp = [ Pb²⁺ ] [ I ]²  ---- ( 1 )

From the question the given value of Ksp = 8.49 * 10⁻⁹

Therefore equation ( 1 ) becomes

8.49 * 10⁻⁹ = ( 0.002549 ) * [ I ]²

[ I ] = √ ( 8.49 * 10⁻⁹ ) / ( 0.002549 )

      = 0.0018 M

Final step : Determine the minimum number of grams of I

moles of I = molarity of I * total volume

                 = 0.0018 M * 10.2 mL

                 = 0.01836 * 10⁻³ mol

Hence we can conclude that The minimum number of grams of I that must be present is ; 0.01836 * 10⁻³ mol

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Based on their nature of waves, seismic waves changes speed as it moves through different materials.

Seismic waves are the waves that are produced and travel through the earth crust during an earthquake.

Seismic waves are often described as elastic waves which is the energy caused by a sudden breaking of rock within the earth's crust.

Seismic waves can travel at different speeds through different types of rock, bouncing back or changing direction.

Therefore, the correct statement which describes a seismic wave during an earthquake is that the wave changes speed as it moves through different materials.

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Answer:

I expect it is barium sulfate

Explanation: