(30 points) Ahhhhhhh can someone help me :'))
I'm not smart and I don't understand how to solve this problem:
Octane, one of the major components of gasoline, burns in air according to this unbalanced equation:
C₈H₁₈ (l) + O₂ (g) ----> CO₂ (g) +H₂O
The formula balanced is: 2 C₈H₁₈ (l) + 50 O₂ (g) ----> 16 CO₂ (g) + 18 H₂O
a) What volume of O₂ at STP is needed to burn 702g (1.00L) of octane?
b) What volume of O₂ at 18°C and 0.975 atm is needed to burn 702g of octane?

Answer:

Mass = 713.4 ×10⁻⁴ g

Explanation:

Given data:

Number of moles of calcium phosphate = 2.3×10⁻⁴ mol

Mass of calcium phosphate = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of calcium phosphate is 310.18 g/mol

by putting values,

2.3×10⁻⁴ mol = mass / 310.18 g/mol

Mass = 2.3×10⁻⁴ mol × 310.18 g/mol

Mass = 713.4 ×10⁻⁴ g

Answer:

you must go to jones im doing the same test

Explanation:

Answer:

geosphere

Explanation:

Answer:

differential weathering.

Explanation:

The empirical formula of the compound is C₃H₄O₂

From the question given above, the following data were obtained:

Carbon = 50.04%

Hydrogen = 5.59%

Oxygen = 44.37%

Divide by their molar mass

C = 50.04 / 12 = 4.17

H = 5.59 / 1 = 5.59

O = 44.37 / 16 = 2.773

Divide by the smallest

C = 4.17 / 2.773 = 1.5

H = 5.59 / 2.773 = 2

O = 2.773 / 2.773 = 1

Multiply by 2 to express in whole number

C = 1.5 × 2 = 3

H = 2 × 2 = 4

O = 1 × 2 = 2

Therefore, the empirical formula of the compound is C₃H₄O₂

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Answer:

C

Explanation:

A. analyzing results

B. collecting data

C. choosing controlled variables

D. making a prediction

The correct answer would be choosing controlled variables.

The controlled variables are factors that are kept constant among the different groups of subjects during the course of an experiment so as to be able to isolate the effects of a single factor - the independent variable.

There are basically 3 types of variables in a scientific experiment;

1. The independent variable

2. The dependent variable

3. The controlled variable

The independent variables are the variables whose effects are to be determined in the course of experiments. The dependent variables are the variables that are actually measured during the course of experiments and whose values vary along with that of the independent variables. The controlled variables are other variables required for the experiment but which must be kept constant among subjects in order to be able to isolate the effects of the independent variable.

The correct option is C.

Answer:

c actual contains three atom

Answer:

Gasses and particles in Earth's atmosphere scatter sunlight in all directions. Blue light is scattered more than other colors because it travels as shorter smaller waves. This it why we see a blue sky most of the time

Explanation:

I looked it up

Answer:

sun shine

Explanation:

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

Answer:

99.90g

Explanation:

1.506 x 10^24atoms × [tex]\frac{1mol}{6.022*10^{23}atoms}[/tex] × [tex]\frac{39.948grams}{1mol}[/tex] = 99.90grams

multiply the atom by constant and by its molar mass

1.506 x 10²⁴ atoms of argons gas is two moles. One mole of argon weighs 35.9 g. Thus mass of two moles of argon is 89.9 g.

Argon is 18th element in periodic table. It is placed in 18 the group and it is a noble gas or inert gas with completely filled orbitals. The group members of argon are neon, krypton, xenon and radon.

One mole of every substance contains 6.022 × 10²³ atoms. This number is called Avogadro number. Therefore, one mole of every element contains Avogadro number of atoms. The atomic mass of an element is the mass of one mole of that element.

Mass of one mole of argon is 35.9 g. Thus, it contains  6.022 × 10²³ atoms. Hence, the number of moles that contains  1.506 x 10²⁴ atoms is calculated as follows:

no.of moles =  1.506 x 10²⁴  / 6.022 × 10²³

                    = 2.5 moles.

The mass of 2.5 moles of argon is 2.5 × 35.9 = 89.9 g. Hence, the mass of  1.506 x 10²⁴ argon atoms is 89.9 g.

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Answer:

Petals are modified leaves that surround the reproductive parts of flowers. They are often brightly colored or unusually shaped to attract pollinators. Together, all of the petals of a flower are called corolla.

Answer:

C. Distance and mass.

Explanation:

Objects that have greater mass have more force of gravity between them.

Answer:

the equation could have mulitplication and square roots which may change the function of the line

Answer:

my best guess is b

Explanation:

typically the lower the pitch the longer the wave line inbetween the inclines are

form the molar concentration of the Ca(OH)2 which is a base we can deduct the pOH

pOH=-lg[OH-]

[OH-]=8.8 x 10-4 M

pOH=4

pH=14-pOH

pH=10

-lg[H+]=10

[H+]=10^-10

The concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ is 5.68×10¯¹² M

The concentration of Hydrogen ion [H⁺] in a solution talks about the acidicity  the solution. Thus, we can obtain the concentration of Hydrogen ion [H⁺] in 8.8×10¯⁴ M Ca(OH)₂ solution as illustrated below:

Data obtained from the question

Concentration of Ca(OH)₂ = 8.8×10¯⁴ M  

Concentration of Hydrogen ion [H⁺] =..?  

Determination of the concentration of Hydroxide ion [OH¯]

 Concentration of Ca(OH)₂ = 8.8×10¯⁴ M

Concentration of Hydroxide ion [OH¯] =?  

Ca(OH)₂ (aq)⇄Ca²⁺ (aq) + 2OH¯(aq)  

From the balanced equation above,  

1 mole Ca(OH)₂ produced 2 moles of OH¯.

Therefore, 8.8×10¯⁴ M Ca(OH)₂ will produce = 8.8×10¯⁴ × 2 = 1.76×10¯³ M

Thus, the Concentration of Hydroxide ion [OH¯] is 1.76×10¯³ M  

Determination of concentration of Hydrogen ion [H⁺].  Concentration of Hydroxide ion [OH¯] = 1.76×10¯³ M

[tex]H^{+} * OH^{-} = 1*10^{-14}\\H^{+} * 1.76^{-3} = 1*10^{-14}[/tex]

Divide both side by 1.76×10¯³  

[tex]H^{+} = \frac{1*10^{-14} }{1.76*10^{-3}}\\[/tex]

[H⁺] = 5.68×10¯¹² M  

Therefore, the concentration of Hydrogen ion [H⁺] in the solution is 5.68×10¯¹² M  

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Answer:

The sugar atoms formed new atoms after caramelization.

Explanation:

When sugar is heated to a certain temperature, it becomes caramel. Te formation of caramel from the sugar is a chemical process.

In the context, Pedro is doing an investigation by heating sugar to make caramel. Burning of the sugar crystal is a chemical change as different chemicals are present in both. The caramel formed cannot be revered back to sugar crystal, this also proves the chemical change of caramelization of sugar cubes. Sugar consists of carbon, oxygen and hydrogen atoms. It reacts with atmospheric oxygen atoms to form new groups of atoms and forms caramel.

Answer:

mass

Explanation:

Answer:

mass mass mass mass mass

Answer:

19.11g

Explanation:

mole = mass ÷ molar mass

mole = 2.61 ÷ 27

mole = 0.097mol

Number of atoms in 2.61g of Aluminum = 6.022 × 10^23 × 0.097

= 0.584 × 10^23

= 5.84 × 10^22atoms

To get the same number of atoms for Gold (Au), we multiply the atomic mass of Au by 0.097mol

Atomic mass of Au = 197g/mol

mass = mole × molar mass

mass = 0.097 × 197

mass = 19.109g

mass = 19.11g

Ranks the objects from most to least dense : X,Z,Y,W

Given

Object W : m=16 g, V=84 cm³

Object X : m=12 g, V= 5 cm³

Object Y : m=4 g, V= 6 cm³

Object Z : m=408 g g, V= 216 cm³

Required

Density

Solution

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

ρ = density  

m = mass  

v = volume  

1. Object W

[tex]\tt \rho=\dfrac{16}{84}=0.19[/tex]

2. Object X

[tex]\tt \rho=\dfrac{12}{5}=2.4[/tex]

3. Object Y

[tex]\tt \rho=\dfrac{4}{6}=0.67[/tex]

4. Object Z

[tex]\tt \rho=\dfrac{408}{216}=1.89[/tex]

From most to least dense : X,Z,Y,W

Answer:

+4

Explanation:

Answer:

the answer to this question is option A mark me as brainliest

Answer:

the molar mass of NaOCl is 74.5g

Answer:

D. Halogens

Explanation:

All elements in these groups have 7 valence electrons, meaning their electronegativity is the highest among the elements.

Answer:

521 nm

Explanation:

From the question given above, the following data were obtained:

Frequency (v) = 5.76×10¹⁴ s¯¹.

Wavelength (λ) =.?

RECALL: velocity (c) of light = 3×10⁸ m/s

Thus, we can obtain the wavelength of the green light by using the following formula:

c = vλ

3×10⁸ = 5.76×10¹⁴ × λ

Divide both side by 5.76×10¹⁴

λ = 3×10⁸ / 5.76×10¹⁴

λ = 5.21×10¯⁷ m

Next, we shall convert 5.21×10¯⁷ m to nanometer (nm). This can be obtained as follow:

1 m = 1×10⁹ nm

Therefore,

5.21×10¯⁷ m = 5.21×10¯⁷ m × 1×10⁹ nm / 1 m

5.21×10¯⁷ m = 521 nm

Thus, 5.21×10¯⁷ m is equivalent to 521 nm

Therefore, the wavelength (λ) of the photon of the green light is 521 nm.

Answer:

the wavelength (λ) of the photon of the green light is 521 nm.

Answer:

6 moles of SO₃ formed.

Explanation:

Given data:

Number of moles of SO₃ formed = ?

Number of moles of oxygen react = 3 mol

Solution:

Chemical equation;

2SO₂+ O₂      →   2SO₃

now we will compare the moles of oxygen and sulfur trioxide.

                             O₂            :            SO₃

                               1             :             2

                               3            :           2/1×3 = 6 moles

Thus, six moles of SO₃ will formed.

Answer:

Cu2+

Srry if I didnt help..

The metallic ion in the compound CuCl₂ is copper (Cu).

CuCl₂ is a combination of copper (Cu) and chlorine (Cl) ions. In this compound, copper has a positive charge of 2, and chlorine has a negative charge of 1. Copper is a type of metal that can make different charged particles (called ions) depending on what it combines with and how it reacts.

In CuCl₂, the copper ion has a positive charge of 2. This means that it has given away two electrons and has an oxidation state of +2. The chlorine ions have a negative charge of -1 because they have taken in one electron. This shows that they have an oxidation state of -1.

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Answer:

Detail is given below

Explanation:

Differences:

Ionization involves the formation of ions while in dissociation substance are break into atoms, ions or molecules.

In ionization atoms and molecules gain positive or negative charge.

While in dissociation positive and negative ions are not essentially formed substance could be break into neutral small particles.

Ionization occur in covalent compounds while dissociation occur in ionic compound.

Ionization example:

Cl + e⁻    →  Cl⁻

Dissociation example:

NaCl   →   Na⁺ + Cl⁻

Here sodium and chloride ions are formed but in sodium chloride these ions were already present.

Another example:

N₂O₄   →     2NO₂

Answer:

The large the atomic radius the more the metallic character of elements

Explanation:

The atomic radius is related to the metallic character in a way that the larger the atomic radius, the more metallic a body becomes.

Therefore, as we go down a group, metallic character increases.

Answer:

Yes

Explanation:

Answer:the plural of walrus is walruses

Explanation:

Answer:

Kinetic Energy (Hope This Helps)

Explanation:

(Brainliest)

Answer:

Chemical energy to kinetic energy. (Arguably heat energy (thermal) because of respiration)

Answer:

Speed is how fast you cover a certain distance

[tex]Speed=\frac{Distance}{time}[/tex]