Balance the following chemical
equation by providing the correct
coefficients.
[? ]FeBr3 + []Na2S → Fe2S3 + NaBr

Answer:9.18 m/s

Explanation:

The average speed for the entire trip is found ......total distance/total time. Remember r*t=d, so divide both sides by t and get r = d/t.

So the cyclist went 800+500+1200 m = 2500 m for total distance.

10t =800 leads to t=80 sec

5t=500 leads to t=100 sec

13t = 1200 leads to t = 92.3 sec

total time is 272.3 sec

Average speed for the entire trip is 2500 / 272.3 = 9.18 m/s

NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95

Given

Reaction and the enthalpy

Required

The change of enthalpy

Solution

Reaction 1

N2 (g) + 3H2 (g) --> 2NH3 ∆ H: -91.8 kJ/mol⇒reverse

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

Reaction 2

C (s, graphite) + 2H2 (g)⇒ CH4 (g) ∆H: -74.9 kJ/mol ⇒reverse

CH4 (g) ⇒ C (s, graphite) + 2H2 (g) ∆H: +74.9 kJ/mol ⇒ x2

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mo

Reaction 3

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g);∆ H: +270.3 kJ/mol

Add up all the reactions and remove the same compound from different sides :

2NH3 ⇒ N2 (g) + 3H2 (g) ∆ H: +91.8 kJ/mol

2CH4 (g) ⇒ 2C (s, graphite) + 4H2 (g) ∆H: +149.8 kJ/mol

H2 (g) + 2C (s, graphite) + N2 (g) ⇒ 2HCN (g) ∆ H: +270.3 kJ/mol

-----------------------------------------------------------------------------------------

2NH3(g) + 2CH4(g) ⇒ 2HCN + 6H2 ∆ H: 511.9 ⇒ :2

NH3(g) + CH4(g) ⇒ HCN + 3H2 ∆ H:255.95

Answer:

C.) Avogadro's number represents the number of particles in one

mole.

Explanation:

Considering the definition of Avogadro's number, the correct answer is option C. Avogadro's number represents the number of particles in one  mole.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole.

Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression.

Avogadro's number applies to any substance.

Finally, the correct answer is option C. Avogadro's number represents the number of particles in one  mole.

Learn more about Avogadro's Number:

Explanation:

Light can't get produced whilst a chemical reaction.

Answer:

A colorless odorless gas evolves

Explanation:

Orange juice is highly acidic. Unripe orange juice is even more acidic! As a result of this, unripe orange juice irritate the digestive tract.

We know that metals that are high up in the activity series evolves hydrogen gas when in contact with acids.

Hence, given the low pH of unripe orange juice, zinc or aluminium will evolve colorless odorless hydrogen gas after some minutes.

Answer:

it's answer is through the charge of an electron and Faraday's constant

Answer:

Carbon monoxide is generally treated as though it was a neutral oxide, however truth be told it is extremely, somewhat acidic. It doesn't respond with water, yet it will respond with hot concentrated sodium hydroxide answer for give an answer of sodium methanoate.

Explanation:

Answer:

2H2O2 → O2 + 2H2O

Explanation:

2H2O2

H : 2x2= 4

O : 2x2=4

O2 + 2H2O

H : 2x2=4

O : 2+2=4

First, be sure to count all of H and O atoms on each side of the chemical equation.  Once you know how many of each type of atom you have you can only change the coefficients (the numbers in front of atoms or compounds) in order to balance the equation.

Answer:

6 oxygen atoms

Explanation:

when 4 atoms of solid aluminium react with 3 molecules of oxygen gas, 6 oxygen atoms will be in the product

Answer:

CT Scan

Explanation:

Radiology is a branch of medicine that uses imaging technology to diagnose and treat disease. So, an example of a radiology technology that is useful for viewing tumors is Computed Tomography (CT)Scan. Others include Magnetic resonance imaging (MRI), X-rays etc.

Explanation:

At the bottom of the energy pyramid, there would be the producers.

In here the producers are grass and wheat. (D)

Answer:

C6H12

Explanation:

Molar mass of C =12.0 H=1.0

12x + 2(1x) = 84

x = 6

so it should be C6H12

The molecular formula of the compound will be C₇H₁₄.

The empirical formula of the compound gives the simplest ratio of the number of different elements present in a compound. The molecular formula of the compound provides the actual number of each element present in a compound. This formula is generally used and can be determined as a multiple of the empirical formula of a compound.

The empirical formula offers the ratio of the number of each atom in a given compound. The composition of a compound is directly determined by its empirical formula.

Given, the empirical formula of the compound is  CH₂.

The empirical formula mass of the compound = 12 + 2 = 14 g

The molar mass of the compound = 84 g

The multiple will be = 84/12 = 7

The molecular formula of the compound = (CH₂)₇ = C₇H₁₄

Therefore, the molecular formula of the compound is C₇H₁₄.

Learn more about the empirical formula, here:

brainly.com/question/14044066

#SPJ2

Answer: The energy changes that occur during a chemical reaction can be shown in a diagram called a potential energy diagram, or sometimes called a reaction progress curve. A potential energy diagram shows the change in potential energy of a system as reactants are converted into products.

Explanation:

Answer:

It shows whether the reaction is exothermic or endothermic.

Explanation:

Answer:

37.85 liters

Explanation:

they need 10 gallons for a month (2.5*4)

after that, convert gallons to liters (conversion to liters= 3.785)

10*3.7585= 37.85

Answer:

Sieve

Explanation:

A sieve or screen would be the best tool to use when separating a mixture of sand and gravel.

Answer:

the third option on edge:)

Explanation:

Answer:

When the denser tectonic plate dives beneath another plate it is due to the high energy by the Earth’s gravity that pushes into the mantle. Earth’s tides, which are caused by a gravitational tug of the Moon and the Sun, also put extra strain on geological faults. how to prepare for an earthquake

Explanation:

C.5

Given:

Electron distribution: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s¹.

A number of electrons present in valence shell of penultimate Shell represents the group of elements.

For s block elements: No. of group=number of valence shell electron.

p block elements: no. of group= 2 + 10 + number of valence electrons.

d block elements: no. of group= number(n-1)d electrons + number of electrons in nth shell.

Here, the differential electron is in p orbital hence, it belongs to p block

No. of group= 2+ 10 + 3=15 i.e. 15th group or VA group.

Therefore, the correct option is B.

Learn more:

brainly.com/question/749030

Answer:

Removing chemicals from pesticides that could be harmful to the environment

Explanation:

This is a main food issue that is not only state-wide but global

1st option doesn't say anything about food issues which makes it unnecessary to address

2nd option is a suggestion and not necessary

4th option is again not exactly towards food issues so no need to address for this question

5th option isn't a issue as much as just something we could do for convenience and stability

6th option should already be in act and is unlawful to do which leads me to the correct option

3rd option is correct because it is still okay globally to put chemicals into our food to keep it looking better for longer amounts of time. Yet it is dangerous to us living beings and the environment.

So therefore 3rd option is correct

(have a great day!)

Answer:

corbonate

Explanation:

i think so. not sure

Answer:

d

Explanation:

because it cause the weather it moves

Answer:

D is the answer ( not 100% sure tho )

Answer:

Volume = 0.2 L

Explanation:

Given data:

Number of moles of NH₄NO₃ = 1.2 mol

Molarity of solution = 6 M

Volume of solution = ?

Solution:

Formula:

Molarity = number of moles / volume of solution

by putting values,

6 M = 1.2 mol / Volume

Volume = 1.2 mol / 6 mol/L

Volume = 0.2 L

Answer:

32.42

Explanation:

fda

Answer:

43.5 moles of HNO₃.

Explanation:

The balanced equation for the reaction is given below:

S + 6HNO₃ —> H₂SO₄ + 6NO₂ + 2H₂O

From the balanced equation above,

6 moles of HNO₃ reacted to produce 2 moles of H₂O.

Finally, we shall determine the number of mole of HNO₃ required to produce 14.5 moles of H₂O.

This can be obtained as illustrated below:

From the balanced equation above,

6 moles of HNO₃ reacted to produce 2 moles of H₂O.

Therefore, Xmol of HNO₃ will react to produce 14.5 moles of H₂O i.e

Xmol of HNO₃ = (6 × 14.5)/2

Xmol of HNO₃ = 43.5 moles

Therefore, 43.5 moles of HNO₃ is required to produce 14.5 moles of H₂O.

C.ice at 0 degree

Explanation:

because sound transmit faster in solid medium as there molecules are cosely packed

Answer:

The Answer to this question is given below in this explanation section.

Explanation:

"C" option is correct

    "ice at 0°C"

sound waves can only travel through a solid,liquid or gas medium.They travel fastest in solids,then liquid and slowest in gases.

Three phases of matter(gas,liquid and solid) sound wave travel in the slowest through gases fastest through solids.Sound wave need to travel through a medium such as solid liquid and gases.The sound wave move through each of these medium by vibrating the molecule in the matter.The molecule in solid are packed very tightly.Liquid as not packed are tightly.And gases are very loosely packed.This enables sound to travel much faster through a solid than gas.Sound travel about four time faster and further in water than it does in air.Sound waves travel about thirteen times faster in wood than air.They also travel faster on hotter days as the molecule bump into each other more often then when it is cold.Sound travels more quickly through solid then through liquids and gases because the molecules of a solid are closer together and,therefore can transmit the vibration faster.sound travels most slowly through gases because the molecule of a gas are farthest apart.    

Answer:

a) 48KJ

b) -48KJ

Explanation:

Given that;

ln(K2/K1) = ΔH°/R(1/T2 - 1/T1)

K2= equilibrium constant at T2

K1 = equilibrum constant at T1

R = gas constant

T1 = initial temperature

T2 = final temperature

When we double the equilibrium constant K1; K2 = 2K1

T1 = 310 K

T2 = 310 + 15 = 325 K

ln(2K1/K1) =- ΔH°/R(1/T2 - 1/T1)

ln2 = -ΔH°/8.314(1/325 - 1/310)

0.693 = -ΔH°/8.314(3.08 * 10^-3 - 3.2 * 10^-3)

0.693 = -ΔH°/8.314 (-0.00012)

0.693 = 0.00012ΔH°/8.314

0.693 * 8.314 = 0.00012ΔH°

ΔH° = 0.693 * 8.314/0.00012

ΔH° = 48KJ

b) K2 =K1/2

ln(K1/2/K1) =- ΔH°/R(1/T2 - 1/T1)

ln (1/2) = -ΔH°/8.314 (1/325 - 1/310)

-0.693 = -ΔH°/8.314  (-0.00012)

-0.693 = 0.00012ΔH°/8.314

-0.693 * 8.314 = 0.00012ΔH°

ΔH°= -0.693 * 8.314/0.00012

ΔH°= -48KJ

Answer:

Mass of water == 1.71 g

Explanation:

Given data:

Initial temperature of water = 10°C

Final temperature of water = 50°C

Energy absorbed = 286 J

Mass of water = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Specific heat capacity of water is 4.18 J/g.°C

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

ΔT =  50°C -  10°C

ΔT = 40°C

by putting  values,

286 J = m × 4.18 J/g.°C × 40°C

286 J = m × 167.2 J/g

m = 286 J / 167.2 J/g

m = 1.71 g

2.999 mol Br

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Step 1: Define

1.806 × 10²⁴ molecules Br

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

[tex]\displaystyle 1.806 \cdot 10^{24} \ molecules \ Br(\frac{1 \ mol \ Br}{6.022 \cdot 10^{23} \ molecules \ Br} )[/tex] = 2.999 mol Br

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

Our final answer is already in 4 sig figs, so there is no need to round.

Answer:

[tex]\boxed {\boxed {\sf About \ 2.999 \ moles \ of \ bromine}}[/tex]

Explanation:

To convert from moles to molecules, we must use Avogadro's Number.

[tex]6.022*10^{23}[/tex]

This tells us the number of particles (atoms, molecules, ions, etc) in 1 mole. In this problem, the particles are molecules of bromine in 1 mole of bromine.

[tex]6.022*10^{23} \ molecules \ Br / 1 \ mol \ Br[/tex]

1. Convert from moles to molecules

Use Avogadro's number as a fraction or ratio.

[tex]\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]

Multiply this fraction by the given number of bromine molecules.

[tex]1.806 *10^{24} molecules \ Br *\frac{6.022 *10^{23} \ molecules \ Br}{1 \ mol \ Br}[/tex]

Flip the fraction so the molecules of bromine can cancel out.

[tex]1.806 *10^{24} \ molecules \ Br* \frac{1 \ mol \ Br}{6.022 *10^{23} \ molecules \ Br}[/tex]

[tex]1.806 *10^{24} * \frac{1 \ mol \ Br}{6.022 *10^{23}}[/tex]

Multiply and condense the expression into 1 fraction.

[tex]\frac{1.806 *10^{24} \ mol \ Br}{6.022 *10^{23} }[/tex]

Divide.

[tex]2.999003653 \ mol \ Br[/tex]

2. Round

The original measurement, 1.806*10^24 has 4 significant figures (1, 8, 0, and 6). We must round our answer to 4 sig figs. For the answer we found, that is the thousandth place.

[tex]2.999003653 \ mol \ Br[/tex]

The 0 in the ten-thousandth place tels us to leave the 9 in the thousandth place.

[tex]\approx 2.999 \ mol \ Br[/tex]

There are about 2.999 moles of bromine in 2.806 *10^23 molecules.

Answer:

Alkali metals are soft and have low melting points.