CHEMISTRY HIGH SCHOOL

Which element has the greatest electronegativity?a. Chlorine
b. Oxygen
c. Sulfur
d. Phosphorus
e. Fluorine

Answers

Answer 1
Answer: Fluorine has the highest. Fluorine's electronegativity is 4.0

Related Questions

Show the formulas of the reactants
Which is a characteristic of a weak electrolyte?
Can someone show me a step by step with the answer?
Why are lichens a good pioneer species after a volcanic eruption
A solid substance is an excellent conductor of electricity. the chemical bonds in this substances are most likely1. ionic, because the valance electrons are shared between atoms2. ionic, because the valance electrons are mobile3. metallic, because the valance electrons are stationary4. metallic, because the valance electrons are mobile

A 1.149 g sample contains only vitamin C (C6H8O6) and sucralose (C12H19Cl3O8). When the sample is dissolved in water to a total volume of 41.1 mL, the osmotic pressure of the solution is 3.18 atm at 287 K. What is the mass percent of vitamin C and sucralose in the sample? a) mass percent vitamin C:%?
b) mass percent sucralose:%?

Answers

The mass percentage of vitamin C is 74.5% and the mass percentage of sucralose is 25.5%.

Osmotic pressure (π) = iCRT

Where;

π = Osmotic pressure = 3.18 atm

i = Van't Hoff factor = 1 (molecular solution)

C = concentration (in mol/L)

R = gas constant = 0.082 LatmK-1mol-1

T = temperature =  287 K

But C = number of moles(n) /Volume (V)

volume = 41.1 mL or 0.0411 L

Substituting into the given equation;

π = n/V × RT

Make n the subject of the formula;

n = πV/RT

n = 3.18 atm ×  0.0411 L/0.082 LatmK-1mol-1 × 287 K

n = 0.0056 moles

Mass of vitamin C = a

Mass of sucralose = b

Mass of sample = 1.149 g

Hence;

a + b = 1.149

b = 1.149 - a

Molar mass of vitamin C = 176 g/mol

Molar mass of sucralose = 398 g/mol

Total number of moles = number of moles of vitamin C + number of moles of sucralose

 0.0056  moles = a/176  + (1.149 - a)/398

70048 ( 0.0056 ) = 398a + 176 (1.149 - a)

392.269 = 398a + 202.224 - 176a

392.269 - 202.224 = 398a  - 176a

190.045 = 222a

a = 190.045/222

a = 0.856 g

But;

b = 1.149 - a

Where a =  0.856 g

b = 1.149 - 0.856

b = 0.293 g

Mass percent vitamin C =  0.856 g/1.149 g × 100/1

= 74.5%

Mass percent sucralose = 0.293/1.149 g × 100/1

= 25.5%

Learn more: brainly.com/question/14191541

The molecular mass of octane is 114.22 g/mol. What is the mass of 22.05 mol of octane?

Answers

In this item, we are asked to calculate for the mass of 22.05 mole of octane given that its molecular mass is equal to 114.22 g/mol. To answer this item, we simply have to multiply the number of moles with the molecular mass. That is, (114.22 g/mol)(22.05 mol) which is equal to 2518.221 grams.
In order to compute the mass of a substance, we may simply mulitply the number of moles of the substance by the molar mass of the substance, since molar mass is mass per mole. Therefore, we get: 114.22 * 22.05 = 2,518.55 grams 2,518.55 grams of octane are present.

Which units express heat capacity

Answers

Answer:

Heat capacity units: J/K

Explanation:

Heat capacity (C) is the amount of heat (Q) required to raise the temperature(T) of a substance by a unit degree.

C = (Q)/(T)

It is usually expressed in terms of J/K

Heat capacity is an intensive property i.e. it is not dependent on the amount of the substance. i.e, the amount of heat required to raise the temperature of 1 g of copper per kelvin would be the same as that corresponding to 100 g.
the heat capacity of a defined system is the amount of heat (usually expressed in calories, kilocalories, or joules) needed to raise the system's temperature by one degree (usually expressed in Celsius or Kelvin). It is expressed in units of thermal energy per degree temperature. To aid in the analysis of systems having certain specific dimensions, molar heat capacity and specific heat capacity can be used. To measure the heat capacity of a reaction, a calorimeter must be used. Bomb calorimeters are used for constant volume heat capacities, although a coffee-cup calorimeter is sufficient for a constant pressure heat capacity.

Describe the general location of the electrons in a covalent bond

Answers

When the Bond Order is higher, bond length is shorter, and the shorter the bond length means a greater the Bond Energy because of increased electric attraction. In general, the shorter the bond length, the greater the bond energy.

How many moles of sodium hydroxide are contained in 65.0 mL of a 2.20 M solution?

Answers

2.20 M means there are 2,20 mol of NaOH in 1 000 mL of solution. We can use this proportion as a conversion factor:

65\ mL\cdot (2.20\ mol)/(1\ 000\ mL) = \bf 0.143\ mol

A sample of an unknown substance has a mass of 0.158 kg. If 2,510.0 J of heat is required to heat the substance from 32.0°C to 61.0°C, what is the specific heat of the substance?

Answers

The specific of the unknown substance that underwent a change in temperature is 0.567 J/g-C. This was solved using the equation for heat transfer which is:

U = mCp(Tf-Ti)

where:
U = heat absorbed or released in joules
m = mass in grams
Cp = specific heat in J/g-C
Tf = final temperature
Ti = initial temperature

Substituting values and converting 0.158 kg to grams gives the value 0.567 J/g-C. You can use a table of specific heat values to determine what the substance is as well.

Answer: 0.469 J / g°C

Explanation:

1) Data:

m = 0.158 kg

Q = 2,150.0 J

ΔT = 61.0°C - 32.0°C

Cs = ?

2) Formula:

Q = m×Cs×ΔT

3) Solution

i) Solve for Cs: Cs = Q / [m×ΔT]

ii) Plug in the data and compute

Cs = 2,150.0 J / [158 g × (61.0°C - 32.0°C) ] = 0.469 J / g°C
Other Questions
Calculate the mass percent composition of sulfur in Al2(SO4)3.
Predict the products in the following reaction:AgNO3(aq) + Na2CrO4(aq) → A. AgCrO4(s) + Na2NO3(aq) B. Ag2CrO4(s) + NaNO3(aq) C. Ag(CrO4)2(s) + Na2NO3(aq) D. Ag(CrO4)3(s) + Na(NO3)2(aq)
What happens to a water bottle in a freezer and why
How much heat energy is produced by 0.5 Wh of electrical energy