Place a check mark next to each star that is only fusing hydrogen into helium at this time.

A change to the investigation which would remove the source of this error is to test a fourth group in which the people do not receive the mineral supplements.

This is the experimental techniques employed in science and involves hypothesis, observations etc.

Removing an error in a scientific method involves repeated experiments and using a large sample which is why the fourth group should be taken into consideration.

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3940.2 is the volume of water vapour that would be produced from the combustion of 815.74 grams of propane ([tex]C_3H_8[/tex]) with 1,006.29 grams of oxygen gas, under a pressure of 1.05 atm and a temperature of 350. degrees C.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Stoichiometric calculations:

[tex]C_3H_8(g) + 5 O_2(g)[/tex]→ [tex]3 CO_2(g) + 4 H_2O(g)[/tex]

From the equation of the reaction, the mole ratio of propane to oxygen is 1:5.

Mole of 815.74 grams of propane = [tex]\frac{ 815.74}{44.1 }[/tex]

Mole of 815.74 grams of propane = 18.49750567 moles

Mole of  1,006.29 grams of oxygen =[tex]\frac{ 1,006.29}{32 }[/tex]

Mole of  1,006.29 grams of oxygen = 31.4465625 moles

Going by the mole ratio, it appears propane is limiting while oxygen is in excess.

From the equation, 1 mole of propane produces 4 moles of water vapour. Thus, the equivalent mole of water vapour will be:

18.49750567 moles x 4 = 73.99 moles.

Using the ideal gas equation:

PV = nRT

v = (73.99  x 0.08206 x 623) ÷ 0.96

v =  3940.2

Hence, 3940.2 is the volume of water vapour that would be produced from the combustion of 815.74 grams of propane ([tex]C_3H_8[/tex]) with 1,006.29 grams of oxygen gas, under a pressure of 1.05 atm and a temperature of 350. degrees C.

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From the calculations that have been done, there are 3 drinks.

The information that we have been provided here is very important. We can obtain the amount of alcohol by looking at the fact that it contains  80-proof liquor.

This 80-proof liquor. is an equivalent of 40% alcohol this means that there is 1.5 ounce of distilled spirit.

Thus, the number of drinks there is;

4.5/1.5 = 3

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In the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.

In the balanced chemical compound C₂H₆O, we can deduce the following;

1 mole of C₂H₆O contains 6 moles of hydrogen

0.2 mole of C₂H₆O = ?

= 0.2 x 6 moles = 1.2 moles of hydrogen

Thus, in the given compound, 0.2 mole of C₂H₆O will contain 1.2 moles of hydrogen.

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Answer:

Molar mass of substance = 40.0 g/mol

Explanation:

• First calculate the number of moles in 3.66 × 10²³ :

no. of moles = number of particles / Avogadro's Number

                     = (3.66 × 10²³)  /  (6.022 × 10²³)

                     = 0.6078 mol

• Now use the following equation to calculate the molar mass:

Molar mass = mass of substance / no. of moles

                   = 24.31 / 0.6078

                   = 40.0 g/mol

Answer:

See below

Explanation:

carbon % = 200.5 / 345.21   * 100% = 58.1 %

hydrogen% = 144.71 / 345.21  *100% = 41.9 %

The normality of the H₂SO₄ that reacted with 25cc of 5 % NaOH solution is 1.1 N.

The molarity of 5% NaOH is 1.32 M

25 cc of NaOH neutralized 30cc of H₂SO₄ solution.

Equation of reaction is given below:

Molarity of H₂SO₄ = 1.32 x 1 x 25/(30 x 2) = 0.55 M

moles of H⁺ ions per mole of H₂SO₄ = 2

Normality of H₂SO₄ = 0.55 x 2 = 1.1 N

In conclusion, the normality of an acid is determined from the molarity and the moles of H⁺ ions per mole of acid.

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The only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.

A triangle can be defined as a one of the plane shapes which has three sides and three angles

So therefore, the only true statement about an exterior angle of a triangle from the above is that it forms a linear pair with one of the interior angles of the triangle.

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Answer:

117.4 kJ (to 4 sf)

Explanation:

(141.3)(0.831) = 117.4 kJ (to 4 sf)

Answer:

sabatomic particle also called elementary particle of any various self contained units of matter or energy that are fundamental constitution of all methods

Answer:

54.7 L

Explanation:

To find the volume, you need to use the Ideal Gas Law. The formula looks like this:

PV = nRT

In this formula,

-----> P = pressure (atm)

-----> V = volume (L)

-----> n = number of moles

-----> R = constant (0.821 L*atm/mol*K)

-----> T = temperature (K)

You need to use the second R constant because the pressure is measured in atmospheres (atm) and not kPa. Because you have the all of the necessary variables except for volume, you can substitute them into the Ideal Gas Law formula and solve.

P = 1.54 atm                       R = 0.821 L*atm/mol*K

V = ? L                                T = 300 K

n = 0.342 moles

PV = nRT

(1.54 atm)V = (0.342 moles)(0.821 L*atm/mol*K)(300 K)

(1.54 atm)V = 84.2346

V = 54.7 L

Answer:

C

Explanation:

C .       specific heat =    J / gm-C

Moles of ammonia

1mol requires 5.66KJ energy

13.5mol requires

Answer:

NO

Explanation:

No, the use of inorganic fertilizer can not increase / cannot contribute the organic matter in the soil.

If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

First, calculate the moles of the gas using the gas law,

PV=nRT, where n is the moles and R is the gas constant. Then divide the given mass by the number of moles to get molar mass.

Given data:

P= 5.2 atm

V= 500 mL =0.5 L

n=?

R= [tex]0.082057338 \;L \;atm \;K^{-1}mol^{-1}[/tex]

T=?

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]Moles = \frac{45 g}{32}[/tex]

[tex]Moles = \frac{45 g}{32}[/tex]

Moles = 1.40625

Putting value in the given equation:

[tex]\frac{PV}{RT}=n[/tex]

[tex]1.40625= \frac{5.2 \;atm\; X \;0.5 \;L}{0.082057338 \;L \;atm \;K^{-1}mol^{-1} X T}[/tex]

T= 22.53167034 K= 22.53K

Hence, If 45 g of O2 gas in a 500 mL container is exerting a pressure of 5.2 atm, 22.53K is the temperature in the gas.

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Answer: 0.680 mol

Explanation:

From the coefficients of the equation, we know that for every 3 moles of carbon dioxide produced, 5 moles of oxygen gas are consumed.

So, the answer is (5/3)(0.408) = 0.680 mol (to 3 sf)

4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.

The Arrhenius equation describes the relationship between the rate of reaction and temperature for many physical and chemical reactions.

As per Arrhenius equation,

k = Ae-Ea÷RT

T = 227 = 500.15 K

R = 0.008314 kJ/K mol

Ea = 150 kJ/mol

Ea÷RT

= 150÷(0.008314 x 500.15)

= 36.073

k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1) (2.156 x [tex]10-{16}[/tex])

k = 4.743 x [tex]10^{-3}[/tex] s-1

So, the correct answer is option d) i.e. 4.7 x [tex]10^{-3}[/tex] s-1

As per Arrhenius equation,

k = Ae-Ea/RT

T = 227 = 500.15 K

R = 0.008314 kJ/K mol

Ea = 150 kJ/mol

Ea÷RT = 150÷(0.008314 x 500.15) = 36.073

k = Ae-36.073 = (2.2 x [tex]10^{13}[/tex] s-1)(2.156 x [tex]10^{-16}[/tex])

k = 4.743 x [tex]10^{-3}[/tex] s-1

Hence,  4.743 x [tex]10^{-3}[/tex] s-1 is the value of the rate constant.

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Hydrochloric acid would be classified as an acid to the Arrhenius definition due to giving of hydrogen ions.

According to Arrhenius concept, hydrochloric acid is an acid which gives hydrogen ions in water while on the other hand, according to Bronsted-Lowry theory, hydrochloric acid is an acid that donates a proton to the water molecule.

So we can conclude that hydrochloric acid would be classified as an acid to the Arrhenius definition due to giving of hydrogen ions.

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Any substance that increases the concentration of [tex]H^+[/tex] in aqueous solutions is Arrhenius's acid.

Arrhenius define acids as substances with the chemical capacities to increase the concentration of hydrogen ion in aqueous solutions.

Thus, substances like HCl, HNO3, HBr, etc. would be considered an acid. This is because they ionize in aqueous solutions as follows:

HCl ---> [tex]H^+[/tex] + [tex]Cl^-[/tex]

[tex]HNO_3 --- > H^+ + NO_3^-[/tex]

[tex]HBr --- > H^+ + Br^-[/tex]

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Answer:

Explanation:

d because a b and c is in correct

The type of nuclear decay in which Oxygen decays to form nitrogen is beta plus decay.

A beta plus decay is a type of decay in which a proton in an element disintegrates to produce a neutron resulting in a decrease in the atomic number of the radioactive element.

In the given equation below:

Oxygen decays to form nitrogen due to a decrease in atomic number.

This is an example of beta plus decay.

In conclusion, oxygen decays to form nitrogen beta plus decay.

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Answer:

A

Explanation:

bc u have to think about it

One central them of Jesus' message was the kingdom of God

The gospel of the Lord Jesus Christ is the ministration of God's words to sinners to repent so they can inherit the kingdom of God

The book of John says: For God so love the world that he gave his only begotten son to the world that whosoever believeth in him shall not perish but have an everlasting life

In conclusion, One major purpose of Jesus' message to humanity was to preach the gospel of the kingdom of God

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We know that 1 kmol = 1000 mol, so 2.43 kmol = 2430 mol.

This means the formula mass of sulfur trioxide is

[tex]32.06+3(15.9994)=80.0582 \text{ g/mol}[/tex]

Therefore, the mass is

[tex](80.0582)(2430)=\boxed{1.95 \times 10^{5} \text{ g (to 3 sf)}}[/tex]

5.7744 g is the mass of the methane gas.

A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.

[tex]Moles = \frac{mass}{molar \;mass}[/tex]

[tex]0.36 mol = \frac{mass}{16.04 g/mol}[/tex]

Mass =5.7744 g

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8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.

Define the molarity of a solution.

Molarity (M) is the amount of a substance in a certain volume of solution. Molarity is defined as the moles of a solute per litres of a solution. Molarity is also known as the molar concentration of a solution.

Given data:

Volume of solution = 0.500 L

Given the mass of  [tex]C_2H_5OH[/tex]= 0.198 kg= 198g

Molar mass of [tex]C_2H_5OH[/tex] = 46.07 g/mol

Moles of [tex]C_2H_5OH[/tex] = 4.297807684

[tex]Molality = \frac{Moles \;solute}{Volume \;of \;solution \;in \;litre}[/tex]

[tex]Molality = \frac{4.297807684}{0.500 L}[/tex]

Molality = 8.595615368 =8.59M

Hence,  8.59 is the concentration of ethyl alcohol when 0.198 kg of ethyl alcohol.

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Answer:

organic compounds with triple bonds are alkynes

Using Newton's second law, the car is experiencing a net force parallel to the banked curve such that

[tex]mg \sin(\theta) = \dfrac{mv^2}r \implies \sin(\theta) = \dfrac{v^2}{rg}[/tex]

where [tex]v[/tex] is the tangential speed of the car and [tex]r[/tex] is the radius of the curve. Solve for [tex]\theta[/tex] :

[tex]\sin(\theta) = \dfrac{\left(61.0\frac{\rm m}{\rm s}\right)^2}{(1860\,\mathrm m)g} \approx 0.204 \implies \theta = \sin^{-1}(0.204) \approx \boxed{11.8^\circ}[/tex]

Answer:

Explanation:

Formula

Heat = m * c * delta t

t = temperature in centigrade.

The first thing you have to do is convert kelvin degrees to centigrade. The conversion factor is - 273. The formula is degrees centigrade = degrees kelvin - 273. It is easier to understand with a couple of examples.

Solution

Heat = 100.0 grams * 4.18 J/g*C * (52 - 17)

Heat = 100 * 4.18 * 35

Heat = 14630 Joules

But you want kj

Heat = 14630 / 100 = 14.63

Answer

Heat = 14.6 kj

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

Which is the safest way to view a solar eclipse?

Answer: Is he B) With a telescope

Since when there is an eclipse you have to use a telescope because the other items are not correct.

I hope I've helped : )