A gas cylinder contains exactly 15 moles of oxygen gas (O2). How many molecules of oxygen are in the cylinder

Answer:

329.7%

Explanation:

Percent Yield = Actual Yield/ Theoretical Yield x 100%

Percent Yield = 105.5g/32 x 100% = 329.69 ≈ 329.7 %

The presence of rust in the water of Westfield is the reason for the change in colour.

The water of Westfield has reddish-brown substance. This reddish brown substance in the water is the rust which formed due to the chemical reaction between the iron pipes and the fertilizer substance present in the water.

Due to this reaction, the colour of Westfield's water is different from normal type of water so we can conclude that the presence of rust in the water of Westfield is the reason for the change in colour.

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Answer:

is it the one where the objective was : To observe the changes in equilibrium when different components are added or taken away.

Answer:

Explanation:

The answer is 9.03 × 10²⁴ molecules.

Avogadro's number is the number of units (atoms, molecules) in 1 mole of substance.

Make the proportion.

6.02 × 10²³ molecules per 1 mol

x per 15 mol

6.02 × 10²³ molecules : 1 mol = x : 15 mol

x = 6.02 × 10²³ molecules * 15 mol * 1 mol

x = 90.3 × 10²³ molecules

x = 9.03 × 10 × 10²³ molecules

x = 9.03 × 10²³⁺¹ molecules

x = 9.03 × 10²⁴ molecules

Answer:

248 miles

Explanation:

At an average altitude of 248 miles (400 kilometers) above Earth, the space station is the third brightest object in the sky.

Answer:

0.027 M HCl

Explanation:

The chemical equation of the neutralization is:

1 NaOH + 1 HCl -> 1 H2O + 1 NaCl

Because the ratio of NaOH and HCl is 1:1 you can use the M1V1=M2V2 formula.

(75 mL)(0.5 M NaOH) = (165 mL)(M HCl)

It requires 0.027 M HCl.

Answer:

2. 16.4 L

3. 243.6K

4. 0.25mol

Explanation:

Using the ideal gas formula for the series of questions in this case, we have;

PV = nRT

Where;

P = pressure (atm)

V = volume (L)

n = number of moles (mol)

R = gas law constant (0.0821 Latm/molK)

T = temperature (K)

QUESTION 2:

V = ?

P = 5 atm

n = 3 mol

T = 60°C = 60 + 273 = 333K

PV = nRT

5 × V = 3 × 0.0821 × 333

5V = 82.02

V = 82.02/5

V = 16.4 L

QUESTION 3:

P = 4 atm

V = 7.5L

n = 1.5mol

T = ?

PV = nRT

4 × 7.5 = 1.5 × 0.0821 × T

30 = 0.123T

T = 30/0.123

T = 243.6K

QUESTION 4:

P = 2.00 atm

V = 3L

n = ?

T = 25°C = 25 + 273 = 298K

PV = nRT

2 × 3 = n × 0.0821 × 298

6 = 24.47n

n = 6/24.47

n = 0.25mol

Answer:

For example, the sugar found in milk is called lactose. With the aid of the enzyme, lactase, the substrate, lactose, is broken down into two products, glucose and galactose. People who don't make enough lactase have trouble digesting milk products and are lactose intolerant.

Answer:

4 oxygen atoms

Explanation:

Answer: One sulphuric acid ( H2SO4 ) molecule has 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Answer:

0.021

Explanation:

that's the answer because I just did an exam that included this question and then the miss explained to me why this was the answer, but don't worry am 100% sure the answer is 0.021 .

The mole fraction of ethanol in a solution of 47.5 g of ethanol in 850 g of water is 0.021.

Mole fraction of any substance present in solution will be calculted by dividing the moles of sample to the total moles of solution.

Moles will be calculated as:

n = W/M , where

W = given mass

M = molar mass

Moles of ethanol will be calculated as:

n = 47.5g / 46.07g/mol = 1.03 moles

Moles of water will be calculated as:
850g / 18g/mol = 47.18 moles

Total moles of solution = 1.03 + 47.18 = 48.21 moles

Mole fraction of ethanol in water will be calculated as:

mole fraction = 1.03 / 48.21 = 0.021

Hence, mole fraction is 0.021.

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Answer:

halving, the mass of planet X and halving the distance between the planets

The gravitational force of attraction is the fundamental force of the universe. Doubling the mass of planet X and halving the distance between the planets increases the gravitational attraction. The correct option is C.

The force of attraction between any two bodies is directly proportional to the product of their masses and is inversely proportional to the square of the distance between them. The formula of gravitational force is given as:

F = G m₁m₂ / r²

From the equation it is clear that the gravitational force increases with the increase in the mass and decreases with the increase in the distance between the objects. This law is true for each particle of matter, each particle of matter attracts every other particles.

Here doubling the mass of planet X and halving the distance between the planets increases the gravitational attractive force.

Thus the correct option is C.

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Answer:CuO

Explanation:

The limiting reagent is the reactant which usually determines when the reaction will stop. The limiting reagent depends on the mole ratio, not on the masses of the reactants present. Here the limiting reactant is .The correct option is B.

The reactant which is entirely used up in a reaction is defined as the limiting reagent. The exact quantity of the reactant which is needed to react with another element can be obtained from the reaction stoichiometry.

Here the masses are converted into moles as:

Moles of CO = 40 / 28 = 1.42

Moles of CuO = 90 / 80 = 1.12

Divide the moles obtained with the coefficients to find the limiting reagent. The smaller number is the limiting reagent.

So CuO is the limiting reagent.

Thus the correct option is B.

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Answer:

d. Two moles of carbon dioxide were produced from this reaction

Explanation:

The given chemical reaction can be written as follows;

2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O

From the above chemical reaction, we have;

Two moles of C₂H₂ reacts with five moles of O₂ to produce four moles of CO₂ and two moles of H₂O

We have;

One mole of C₂H₂ will react with two and half moles of O₂ to produce two moles of CO₂ and one mole of H₂O

Therefore, in the above reaction, when one mole of C₂H₂ is used, two moles of CO₂ will be produced.

React with metal : property of acidic solutions.

PH > 7 : property of basic solutions.

Feels slippery: property of basic solutions

PH = 7: property of neutral solutions.

Tastes sour : property of acidic solutions.

more H+ ions than : property of acidic

OH- ions solutions.

OH- ions & H+ ions : property of neutral

present in equal solutions

amount

PH< 7 : property of acidic solutions.

conducts : property of acid solutions,

electricity property of basic solutions,

in Water property of acid & base

solutions

Tastes bitter : property of basic

solutions.

Answer:

Potassium Bromide

Explanation:

not sure but i think thats it

Answer:

answer is d

i hope this helps you

The reaction that represents natural nuclear decay is 335 U → He + 331 Th, i.e., option C.

Nuclear reactors continue to operate by enclosing the nuclear fission process.

Even after fission has stopped, radioactive decay of fission products and transuranic elements formed in a reactor produces heat.

Fission reactions can be moderated in order to increase fission or unmoderated in order to breed more fuel.

The reaction that represents natural nuclear decay is

Thus, the correct option is C.

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Answer:

0.075 moles of iron oxide would be produced by complete reaction of 0.15  moles of iron.

Explanation:

The balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

You can apply the following rule of three: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, 0.15 moles of Fe produce how many moles of Fe₂O₃?

[tex]moles of Fe_{2} O_{3} =\frac{0.15 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}[/tex]

moles of Fe₂O₃= 0.075

0.075 moles of iron oxide would be produced by complete reaction of 0.15  moles of iron.

Answer:

This natural gas deposit contains 1,300,813.008 moles.

Explanation:

An ideal gas is a theoretical gas that is considered to be composed of point particles that move randomly and do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of the gases:

P * V = n * R * T

In this case:

Replacing:

15 atm* 2.24*10⁶ L= n*0.082 [tex]\frac{atm*L}{mol*K}[/tex]* 315 K

Solving:

[tex]n=\frac{15 atm* 2.24*10^{6}L }{0.082\frac{atm*L}{mol*K}*315 K}[/tex]

n=1,300,813.008 moles

This natural gas deposit contains 1,300,813.008 moles.

Answer:

:D

Explanation:

8. D. All of the above

9. C. Mechanical weathering

10. D. All of the above

Answer:

8. D

9. A

10. D

Answer:

c. Ca(OH)2

Explanation:

I took the test ;)

In chemistry, bases are substances that react with an acid to yield salt. Calcium hydroxide (Ca(OH)₂) is a base as it is a hydroxide of metal. Thus, option c is correct.

Bases are solutes that react with acidic substances to produce water and salt. It comprises substances with hydroxide ion that reacts with hydrogen ion of acid to complete the neutralization reaction.

The carbonates, oxides, and hydroxides of metals make the base that has a pH range of below 7 up to 14. The alkalinity of the substance depends on the ability to release the hydroxide ions in the solution.

Calcium hydroxide (Ca(OH)₂) is a base as it contains OH⁻ ions that are characteristic of bases. On the other hand, NaCl is salt and HF is an acid.

Therefore, Ca(OH)₂ is a base.

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Answer:

It partially ionizes

Explanation:

Higher tier) Weak acids only partially ionise in water. Only a small fraction of their molecules break into hydrogen ions when added to water.

Answer: An example is NaCl which exist as a ionic compound which has  an ionic bond  

Explanation: First of all , ionic bonds is the bond formed when a metal and a non metal reacts together.

in sodium chloride it contain sodium and chlorine IONS which are charged particles. the charged particles which are the ions are held together with these force of attraction hence creating such ionic bonds between them

so Na ions and the Cl ions are held together by their ions

Na± and the Cl±

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Answer:

600.7 moles

Explanation:

Applying,

PV = nRT................... Equation 1

Where P = Pressure of oxygen, V = Volume of oxygen, n = number of moles, R = molar gas constant, T = Temperature.

make n the subject of the equation

n = PV/RT............... Equation 2

From the question,

Given: P = 190 atm, V = 35 L, T = 135 K

Constant: R = 0.082 atm.dm³/K.mol

Substitute these values into equation 2

n = (190×35)/(135×0.082)

n = 600.7 moles of xygen

A gas occupies 900.0 mL at a temperature of 27.0°C. What is the volume if the temperature is 105°C ?

Explanation:

[tex] \frac{V _{1} }{T _{1}} = \frac{V _{2} }{T _{2}} \\ \frac{(900)}{(27 + 273)} = \frac{V _{2}}{(105 + 273)} \\ V _{2} = \frac{340200}{300} \\ V _{2} = 1134 \: ml[/tex]

Answer:

54.93 g/mol

Explanation:

a) the element with symbol Mn is known as Manganese and I figured it out by looking at the periodic table.

b) I took a look at the periodic table again, and seen how much the atomic mass is and from there I observed:

Mn= 54.938 g/mol

rounded is 54.94 g/mol

Answer:

1. food

2.energy

3.digestion

4. system

5. mouth

6.chewed

7.

8. saliva

9swallow

10 oesophagus

11 stomach

12

13 acid

14. small intestine

15. absorbed

16

17large intestine

18 waste

sry there are some i am not sure

Answer:

See Explanation

Explanation:

Volume of base used  = (31.79 - 1.6) + (32.12 - 0.98) + (42.87 -13.21)/3 = 30.34 cm3

Volume of acid used = (24.86 - 0.42) + (24.11 - 0.11) + (27.67 -3.42)/3 = 24.23 cm3

For trial 1= number of moles of HBr = 24.44/1000 * 0.3 = 0.0073 moles

For trial 2= number of moles of HBr = 24/1000 * 0.3 = 0.0072 moles

For trial 3= number of moles of HBr = 0.0089 moles

HBr(aq) + KOH(aq) -----> KBr(aq) + H2O(l)

One mole of base is required to neutralize one mole of acid.

From CAVA/CBVB =nA/nB

CAVAnB = CBVBnA

CB = CAVAnB/VBnA

CB = 0.3 * 24.23 * 1/30.34  * 1

CB = 0.24 moldm-3

number of moles of KOH = concentration * volume

number of moles = mass/molar mass

molar mass of KOH = 56 g/mol

mass/56 =  0.24 * 30.34/1000

mass = 0.24 * 30.34/1000 * 56

mass =0.408 g of KOH