**Answer: First, here is the balanced reaction: 2C4H10 + 13O2 ===> 8CO2 + 10H2O.**

**This says for every mole of butane burned 4 moles of CO2 are produced, in other words a 2:1 ratio.**

**Next, let's determine how many moles of butane are burned. This is obtained by **

**5.50 g / 58.1 g/mole = 0.0947 moles butane. As CO2 is produced in a 2:1 ratio, the # moles of CO2 produced is 2 x 0.0947 = 0.1894 moles CO2.**

**Now we need to figure out the volume. This depends on the temperature and pressure of the CO2 which is not given, so we will assume standard conditions: 273 K and 1 atmosphere.**

**We now use the ideal gas law PV = nRT, or V =nRT/P, where n is the # of moles of CO2, T the absolute temperature, R the gas constant (0.082 L-atm/mole degree), and P the pressure in atmospheres ( 1 atm).**

**V = 0.1894 x 0.082 x 273.0 / 1 = 4.24 Liters.**

**Explanation:**

2. Suppose two astronauts were outside of the space shuttle orbiter while orbiting Earth. The audio speaker in the helmet of one of the astronauts quits working. The other astronaut is only one meter away, so she shouts a message to him. Can he hear her? Explain.

Don’t click that link. But the answer would be no. That is because there is no matter in space, which means the sound can’t travel. Sound waves are literally vibrations between molecules, and in space there is no molecules, therefore no sound

The air we breathe is a(n) _____.

Gas thank me later bro

waste of time.

air = breathing = overrated

air = breathing = overrated

1. How many moles are in 3.50 grams of NaCl?

0.0600 mol

O 203 mol

O 78.4 mol

O 0.156 mol

78 think that me the answer

Four metals were kept in contact with each other. The table below shows the initial temperature of the metals.

Metal Initial Temperature

А

30 °C

B

42 °C

С

25 °C

D

16°C

From which metal will heat flow into all the other metals?

Metal A

Metal B

Metal C

Metal D

The answer to this is b

**Answer:**

The answer is B

**Explanation:**

I'm just big-brained

And because it's hotter than the rest and since all of them are cold "B" is just going to make them warmer.

The products of self-ionization of water are

H+

H20

H+ and OH-

OH-

**Answer:**

3

H+ and OH-

**Explanation:**

The substances below are listed by increasing specific heat capacity value. Starting at 30.0 °C, they each absorb 100 kJ of thermal energy. Which one do you expect to increase in temperature the most? (3 points)

a

Silver, 0.239 J/(g °C)

b

Aluminum, 0.921 J/(g °C)

c

Lithium, 3.56 J/(g °C)

d

Water, 4.184 J/(g °C)

**Answer:**

the answer is B

**Explanation:**

The driest desert on Earth is the several years to not receive any rainfall. desert. There it has been recorded for O Atacama Sahara (T) Antartic ( Gobi

**Answer:**

Atacama

**Explanation:**

which system does the endocrine gland influence to fight infections

**Answer:**

Thymus. This gland makes white blood cells called T-lymphocytes that fight infection and are crucial as a child's immune system develops

In an effort to sanitize his water, Beethoven knows that bromine can be used to purify water. If Beethoven has 2.12 x 1022 formula units of aluminum bromide are reacted with excess chlorine gas, how many milliliters of liquid bromine (density = 3.12 g/mL) are formed?

**Answer:**

2.7 mL

**Explanation:**

The equation of the reaction is;

2AlBr3 + 3Cl2 -----> 2AlCl3 + 3Br2

Number of moles in 2.12 x 1022 formula units of aluminum bromide

1 mole of AlBr3 = 6.02 * 10^23 formula units

x moles = 2.12 x 1022 formula units

x = 2.12 x 1022 formula units * 1 mole/ 6.02 * 10^23 formula units

x = 0.0352 moles of AlBr3

According to the reaction equation;

2 moles of AlBr3 produces 3 moles of Br2

0.0352 moles of AlBr3 produces 0.0352 moles * 3 moles /2 moles

= 0.0528 moles of Br2

Mass of Br2 produced = 0.0528 moles of Br2 * 159.808 g/mol

Mass of Br2 produced = 8.44g

But density = mass/volume

volume = mass/density

volume of Br2 = 8.44 g/ 3.12 g/mL

volume of Br2 = 2.7 mL

How many atoms are in 9.44 moles of Al?

The answer is D which is 23

**Answer:**

c) %5.68×10²⁴

**Explanation:**

**Number atoms=Avogadro's number ₓ number of moles**

**N= 6.023ₓ 10²³×9.44**

**N=5.68×10²⁴**

If you want to change the type of element your atom is, you can either

(2 RIGHT CHOICES)

add a proton

add a neutron

add an electron

**Answer:**

Add a proton and add a neutron

If you have 1.5 grams of silver nitrate, how many grams of silver could

you produce?

**Answer:**

0.95g of Ag we can produce

**Explanation:**

To solve this question we have to convert the mass of silver nitrate (AgNO₃) to moles. The moles of silver nitrate = Moles of Ag. Then, with molar mass of Ag we can know the mass of silver:

*Moles AgNO₃ -Molar mass: 169.87g/mol-:*

1.5g * (1mol / 169.87g) = 0.0088 moles Ag

*Mass Ag -Molar mass: 107.87g/mol-:*

0.0088 moles Ag * (107.87g / mol) =

0.95g of Ag we can produceQ3. When copper (II) chloride reacts with silvernitrate, copper (II) nitrate and silverchloride are formed.Write the balanced equation for the reaction given above:A.CuCl2(aq) + 2 AgNO3(aq) →Cu (NO3)2(aq) + 2 AgCl(s)B.CuCl2(aq) + NaNO3(aq) →Cu (NO3)2(aq) + AgCl(s)C.CuCl2(aq) + 2 NaNO2(aq) →Cu (NO2)2(aq) + 2 AgCl(s)D.CuCl(aq) + NaNO3(aq) →Cu NO3(aq) + AgCl(aq

**Answer:**

See explanation

**Explanation:**

When we are writing chemical reaction equations, we must ensure that such equations are balanced. That is, the number of atoms of each element on both sides of the reaction equation are exactly the same.

After we identify the formula of each compound in the reaction, then we proceed the write the balanced reaction equation as follows;

CuCl2 + 2AgNO3 -------> Cu(NO3)2 + 2AgCl

can silver nitrate test the purity of water

yes it can in many ways

Metallic bonding is sometimes referred to as a "sea of electrons." I sometimes picture is as cheerios (nuclei) floating around in milk (valence electrons). And while metallic bonding has the name "bond" it can be very different from Ionic and Covalent Bonds.

In complete sentences describe how Metallic bonds are alike, and how they are different from the other bond types we have studied.

They start from that area

i have six protons and six neutrons. i need help whats the answerrrrrr

**Answer:**

Carbon-12: with 6 protons and 6 neutrons and an atomic mass of 12.

**Explanation:**

Which statement regarding this equation is TRUE?

4Fe (s) + 3O2 (g) —> 2Fe2O3 (s)

There are 2 reactants.

The coefficient on O2 is 8.

Iron (III) oxide is a gas.

There are 5 atoms of oxygen on the reactant side.

**Answer:**

iron (III) oxide is a gas

Which adaptation allowed gymnosperms and angiosperms to become the most dominant types of plants on earth?

O pollen

O flowers

O seeds

O fruit

I believe the answer is Seeds , SORRY IF U GET IT WRONG LUV

One mole of CO2(g) is expanding isothermally and reversibly from a volume of 0.100 dm3 to a volume of 100 dm3. Calculate the work in "kJ" of the expansion process if: 1/ the gas is considered real gas. (Hint: use the Van Der Waals equation for real gases to express the pressure in the work equation). 2/ The gas is considered perfect gas. Given: The constants for CO2(g) are: a= 3.59 atm L2/mol2, b= 0.0427 L/mol Answer: a) the expansion work for CO2 as real gas is W = kJ. b) the expansion work for CO2 as perfect gas is W = kJ.

**Solution :**

For the real gas following Vander Waals equation, reversible isothermal work done is given by :

[tex]$W= \int P \ dV$[/tex]

[tex]$W= \int \left(\frac{nR}{V-nb}-\frac{an^2}{V^2}\right) dV$[/tex]

[tex]$W_{real}=-nRT \ln \left[\frac{V_2-b}{V_1-b}\right]-an^2\left[\frac{1}{V_2}-\frac{1}{V_1}\right]$[/tex]

Given : [tex]$V_1=0.1 \ dm^3$[/tex], [tex]$$V_2 =100 \ dm^3[/tex]

[tex]$a=359 \ atm \ L^2/ mol^2, \ \ b = 0.0427 \ L/mol$[/tex]

As T is not given, assuming T = 290 K

[tex]$W_{real} = 0.0823 \times 240 \left[ \ln \left(\frac{100-0.042}{0.1-0.0427}\right)\right]-3.59\left[\frac{1}{100}-\frac{1}{0.1}\right]$[/tex]

[tex]$W_{real}= -183.06+35.864$[/tex]

[tex]$W_{real}=-147.196$[/tex]

For the perfect gas,

[tex]$W=nRT \ln\left[\frac{V_2}{V_1}\right] =(1)(0.0823)(290) \ln \left[\frac{100}{0.1}\right]$[/tex]

[tex]$W_{ideal}=169.415$[/tex] kJ

A gas has a volume of 15.0 ml at 25 degree Celsius. What is the volume of the gas at 50 degree Celsius.

**Answer:**

30.0ml

**Explanation:**

Half of fifty is 25 and 25 represents 15.0ml so 15.0ml×2=30.0ml there for 25+25 is 50

PLEASE HELP I'M SO DOOMED

A balloon that contains 2.8 mol of helium gas has a volume of 31 L. If 3.5 g of helium is added, what will be the new volume of the balloon? Assume the temperature and pressure remain the same. The molar mass of helium is 4.00 g/mol.

a) 186 L

b) 70 L

c) 24 L

d) 41 L

Do not post links

**Answer:**

D

**Explanation:**

31 / 2.8 = 11.0714286 L per mole of helium

3.5 / 4 = 0.875 moles

2.8 + 0.875 = 3.675 moles

11.0714286 x 3.675 = 40.6875 L

Can someone answer this, NO ROBOTS!!!!

Genetic engineering improved the lives if individuals with insulin because it helps the body use and store sugar, since people with diabetes can't produce insulin.

does anyone know this please?

**Answer:**

1.) b

2.) c

3.) e

4.) g

5.) j

6.) k

HOPE THIS HELPS

-Todo <3

**Explanation:**

**Answer:B, C, F, G, I, L.**

**Explanation: i think that these are the correct one there was not a whole lot of contects on the question**

Type the correct answer in the box. Express your answer to two significant figures.

A reaction between 1.7 moles of zinc Ipdide and excess sodium carbonate ylelds 12.6 grams of zinc carbonate. This is the equation for the

reaction:

Na2CO3 + Zniz - 2Nal +

ZnCoz.

What is the percent yield of zinc carbonate?

The percent yield of zinc carbonate is

5.91

1X.

**Answer: The percent yield of zinc carbonate is 5.91 %**

**Explanation:**

To calculate the moles :

[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}[/tex]

[tex]\text{Moles of} ZnCO_3=\frac{12.6 g}{125.4g/mol}=0.100moles[/tex]

[tex]ZnI_2[/tex] is the limiting reagent as it limits the formation of product and [tex]Na_2CO_3[/tex] is the excess reagent.

[tex]Na_2CO_3+ZnI_2\rightarrow 2NaI+ZnCO_3[/tex]

According to stoichiometry :

1 mole of produce = 1 mole of

Thus 1.7 moles of [tex]ZnI_2[/tex] will produce=[tex]\frac{1}{1}\times 1.7=1.7moles[/tex] of [tex]ZnCO_3[/tex]

Theoretical yield of [tex]ZnCO_3=moles\times {\text {Molar mass}}=1.7moles\times 125.4g/mol=213.2g[/tex]

percentage yield = [tex]\frac{\text {Experimental yield}}{\text {Theoretical yield}}\times 100=\frac{12.6g}{213.2g}\times 100=5.91\%[/tex]

**Answer:**

the other person was right EXCEPT it says in 2 significant numbers so the answer is **5.9**

**Explanation:**

i hope this helps. have a wonderful day :))

Need help on science ASAP

**Answer:**

3

**Explanation:**

The plates are moving away from each other

What evidence from the experiment shows that conduction occurred? In your answer, be sure to include the materials involved in the transfer of heat through conduction.

Answer:

Sample Response: The melting of the chocolate pieces one by one showed that it was caused by heat flowing through the foil bridge. The transfer of heat happened between the foil bridge and the chocolate pieces because they were touching each other.

Answer:

The conduction was made by the foil which was touching the chocolate made the chocolate slowly melt because of the tea light giving heat to the foil the foil conducted it to the chocolate causing it to melt.

Explanation:

Conduction is the transfer of heat through touch.

Convection is the transfer of heat through liquid or gas.

Radiation is how heat/energy travels through space.

Hope this helped!

An object has balanced forces acting on it. Which of the following describes the result these balanced forces have on the object? A. It remains at rest or speeds up in the same direction. B. It speeds up in the same direction or moves at constant speed. C. It speeds up in the same direction or slows down. D. It remains at rest or moves at constant speed in the same direction.

**Answer:**

C.It remains at rest or moves at constant speed in the same direction.

**Explanation:**

First, remember the Newton's 1st law of motion which states that the object at rest will remain at rest and that in motion will stay in motion with the same speed and same direction unless acted by unbalance forces.

Balanced forces on an object occur when two forces at act on an object are equal in size and act in opposite direction. In this case, a stationary object will stay at rest while an object moving will continue to move at the same speed and same direction.

An object acted by balanced forces is said to be at equilibrium, thus the state of motion will be maintained.The object will not accelerate. A good example of an object acted by balanced forces is an object at rest or in constant motion such as a car that stopped at red-light signal or a car travelling at a constant speed.

omg pls help i dunno what the frick frack this is

Answer:

1. Mass of KCl produced = 774.8 g of KCl

2. Mass of KNO₃ produced = 13.837g

3. Moles of NaOH made = 0.846 moles

4. Moles of LiCl produced = 0.846 moles

5. Moles of CO₂ produced = 207.6 moles

Explanation:

1. From the equation of reaction, 1 mole of ZnCl₂ produces, 2 moles of KCl.

5.02 moles of ZnCl₂ will produce, 2 × 5.02 moles of KCl = 10.4 moles of KCl

Molar mass of KCl = (39 + 35.5) g/mol = 74.5 g/mol

10.4 moles of KCl = 10.4 × 74.5 g

Mass of KCl produced = 774.8 g of KCl

2. Mole ratio of KNO₃ and KOH = 1:1

O.137 moles of KOH will produce 0.137 moles of KNO₃

Molar mass of KNO₃ = 101 g/mol

Mass of KNO₃ produced = 0.137 × 101 g = 13.837g

3. Molar mas of Ca(OH)₂ = 74.0 g

Moles of Ca(OH)₂ in 31.3 g = 31.3/74.0 = 0.423 moles of Ca(OH)₂

Mole ratio of NaOH and Ca(OH)₂ in the reaction = 2 : 1

Moles of NaOH made = 2 × 0.423 = 0.846 moles

4. Molar mass of MgCl₂ = 95.0 g

Moles of MgCl₂ in 40.2 g = 40.2/95.0 = 0.423 moles

From the reaction equation, mole ratio of MgCl₂ and LiCl = 1:2

Moles of LiCl produced = 2 × 0.423 = 0.846 moles

5. From the equation of reaction, 1 mole of C₆H₁₀O₅ produces 6 moles of cO₂

34.6 moles of C₆H₁₀O₅ will produce 34.6 × 6 moles of CO₂

Moles of CO₂ produced = 207.6 moles

H IT H-C --H + Ħ Н The model above shows the structural formula for ethane. What is the chemical formula for ethane? OA. C2H6 OB. 2CH3 Oc. 8CH OD. C6H2

**Answer:**

B

**Explanation:**

help pleaseeee. over dilutions in chemistry

Answer:

5 L

Explanation:

We'll begin by calculating the molarity of the CaCl₂ solution. This can be obtained as follow:

Mole of CaCl₂ = 0.5 mole

Volume = 2 L

Molarity =?

Molarity = mole /Volume

Molarity = 0.5 / 2

Molarity = 0.25 M

Finally, we shall determine the volume of the diluted solution. This can be obtained as follow:

Molarity of stock solution (M₁) = 0.25 M

Volume of stock solution (V₁) = 2 L

Molarity of diluted solution (M₂) = 0.1 M

Volume of diluted solution (V₂) =?

M₁V₁ = M₂V₂

0.25 × 2 = 0.1 × V₂

0.5 = 0.1 × V₂

Divide both side by 0.1

V₂ = 0.5 / 0.1

V₂ = 5 L

Thus the volume of the diluted solution is 5 L

which of the following statements best describes the role of adenylyl cyclase in the epinephrine signaling pathway?a. It converts polymer to its monomer subunits. b. It move sudstances acruss the plasma membranec. It accelerates the production of second messengerd. It transfers phosphate groups from ATP protein substrates
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