Chemistry College

How many moles of lithium fluoride (LiF) are in a 8.5 g sample?

Answers

Answer 1

.36 mol LiF I believe. When I set the equation that’s what I got

Related Questions

What is the mass of 48 ml of a liquid if its density is 1.25 g/ml?

Answers

Answer:

60 g

Explanation:

Mass = Density × Volume

Mass = 1.25 × 48

Mass = 60 g

I hope this helps!

Hypothesis: What do you think will happen when you add more magnets to the set up?

Answers

Answer:

........................

True or False:

Houston, Texas received approximately 2 inches of snow on February 15, 2021. Based on this, we can now say Houston's climate consists of long, freezing winters and yearly snowfall. Please answer ASAP. Thanks

Answers

Answer:

False.

Explanation:

I majored in Chemistry

WILL GIVE BRAINLIEST!!!

Use this media to help you complete the question.

There are three known forms of hydrogen. These forms are called (isotopes, ions, copies) of each other. Each of these forms will have the same number of (neutrons, protons, electrons) but different numbers of (neutrons, protons, electrons) in their nuclei.

Answers

Answer:

Isotopes, protons, netrons

Explanation:

Answer:

There are three known forms of hydrogen. These forms are called Isotopes of each other. Each of these forms will have the same number of protons but different numbers of neutrons in their nuclei.

Explanation:

An artificial reef is intended to affect the ocean ecosystem by — А A removing pollution from the water B В providing shelter for marine organisms causing sediment to erode into deeper waters D preventing people from overfishing along the shore

Answers

Answer:

Explanation:

just answered

An artificial reef is intended to affect the ocean ecosystem by providing shelter and habitat for marine organisms causing sediment to erode into deeper waters. Hence, option C is correct.

What is artificial reef ?

An artificial reef is a human-made underwater structure, typically constructed with the purpose of enhancing marine biodiversity, providing habitat for marine organisms, and promoting recreational activities like fishing, diving, and snorkeling.

Artificial reefs can be created from a variety of materials, such as concrete, metal, tires, and sunken ships. The reef structure can also increase the overall biodiversity of an area by creating a new habitat for species that may not have been present before.

Additionally, the presence of an artificial reef can help to reduce pressure on natural reefs by providing an alternative location for fishing and other activities. However, artificial reefs are not typically used as a means of removing pollution from the water or preventing erosion.

Therefore, option C is correct.

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Elements are solid liquid and gas substance that can be found on earth which statements best describes an element

Answers

Answer:

i guess

Explanation:

we will never know

Equation for questions 1-4:
4A1+302 → 2A1203
How many moles of oxygen are needed to react with 7.5 moles of aluminum

Answers

Answer:

5.625 moles of oxygen, O₂.

Explanation:

The balanced equation for the reaction is given below:

4Al + 3O₂ —> 2Al₂O₃

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂.

Finally, we shall determine the number of mole of O₂ required to react with 7.5 moles of aluminum, Al. This can be obtained as illustrated below:

From the balanced equation above,

4 moles of Al reacted with 3 moles of O₂.

Therefore, 7.5 moles of Al will react with = (7.5 × 3)/4 = 5.625 moles of O₂.

Thus, 5.625 moles of O₂ is needed for the reaction.

Which one of the following ionic solids would have the largest lattice energy?

CaBr2

CsI

CaCl2

NaCl

NaF

Answers

Answer:

CaCl2

Explanation:

The ionic solid CaCl₂ would have the largest lattice energy. Therefore, option (c) is correct.

What is the lattice energy?

Lattice energy is the heat of formation when one mole of crystalline ionic solid is generated from its constituent ions in their gaseous state.

For example, the lattice energy of sodium chloride crystal is the energy change of reaction when Na⁺ and Cl⁻ ions react to produce a NaCl crystal, which is equal to -786 kJ/mol.

The relation between lattice energy and lattice enthalpy at constant pressure is given by:

ΔU (lattice) = ΔH (lattice) - PΔV

Lattice energy is directly proportional to the charge on ions and inversely proportional to the interionic distance between ions.

For NaCl and NaF the charge on the ions is +1 and -1 while the size of the ions is small. So they have less lattice energy.

CsI ionic solid have a larger size of ions Cs⁺ and I⁻. So CsI will have less lattice energy. CsBr₂ has +2 charge on calcium but the size of both ios is larger. So, CsBr₂ will have less lattice energy.

CaCl₂ has + 2 charge on calcium as well as the ionic radius is also samll. Therefore, CaCl₂ would have the largest lattice energy.

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pls help
Plot the point (5,9)

Answers

All u do is go to 5 and up nine and just put a little cross

go five across the x axis, then go nine straight up from there

5 What does 2Na2O mean?

Answers

Answer:

2 Na2O means two molecules of Sodium oxide.

mark me please

How many electrons does potassium have in its outside electron shell?

Answers

Answer:

Potassium (K) is of atomic number 19 and has only 1 electron in the outermost shell

And this is because of the octet rule of chemistry followed while determining the number of electrons in each shell.

According to the octet rule, there can only be a maximum of 8 electrons in the outer shell of an atom, So when 'L' shell of K is filled with 8 electrons to accommodate the 19th electron a new shell will be created

What is it called when two or more atoms are chemically bonded together?
a.Electron
b.Two atoms
c.Molecule
d.Material

Answers

Answer:c

Explanation: A molecule is two atoms bonded together

In a graph, what effect would adding a catalyst have on D?

A. It would decrease.
B. It would increase.
C. It would stay the same.
D. You cannot tell from this graph.

Answers

It would decrease hope this helps

Answer:

C. It would stay the same

Explanation:

PLATO answer

Jewelry and tableware are sometimes made of sterling silver. Sterling silver is 92.5% silver (Ag) and 7.5% copper (Cu). If you wanted to make 30 grams of sterling silver for a ring, how many grams of silver and copper would you need to start with?
Amount of sterling silver?
Amount of copper?
total grams of alloys needed?

Answers

Answer:

12.33

Explanation:

92.5/7.5= 12.33

30g of the sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.

What is cross multiplication?

Cross multiply fractions by multiplying one fraction's denominator by the other fraction's numerator and then comparing the two values. The larger fraction is the one with the higher value.

100g of sterling silver contains 92.5g of silver and 7.5g of copper.percentage of element = amount of the element present in 100 g of material

Therefore,

100g sterling silver = 92.5g silver30g sterling silver = X g silver

( cross multiplication),

100 × X = 92.5 × 30

X = 92.5 × 30/ 100

X= 27.75g silver

100g sterling silver = 7.5g copper

30g sterling silver= Y g copper

(cross multiply)

100 × Y = 7.5 × 30

Y= 7.5 × 30 / 100

Y= 2.25g copper

X (silver)= 27.75 g in 30 g of sterling silverY (copper)= 2.25 g in 30 g of sterling silver

therefore, 30g of sterling silver ring contains, 27.75 g of silver and 2.25 g of copper.

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What is the density of a brick with a mass of 150gm and the sides are 2cm long 5cm high and
5cm wide?

Answers

Density= Mass/Volume
1) volume- 2x5x5= 50
2) density- 150/50= 3
Hope this helped :)

1.I make my cup of coffee in the morning by pouring boiling water over ground-up coffee beans held in a special piece of paper and by collecting the brown liquid that comes through. Which techniques of the five described in the background section is/are used in the preparation of the cup of coffee

Answers

Answer:

Filtration

Explanation:

Filtration is a physical separation technique that is used to separate solids from liquids or gases. The process involves the use of a filter which allows just the liquid to pass through.

In this case, the coffee beans is the solid and the boiling water is the liquid. The special piece of paper is the medium (filter) through which the coffee is collected.

The coffee coming through the special piece of paper (filter) is called a filtrate.

Filtration is used in the preparation of the cup of coffee.

Pls help I’ll mark brainliest pls pls pls

Answers

The tea was no longer hot or (brewed) so the 5th didn’t dissolve like the others because the tea was hot or warm enough anymore it cooled down. So the sugar won’t dissolve no more.

Answer:

the tea was not hot sugar dissolves quickly and hot water than cold

6. What is a solution an example of?
A) element
B) heterogeneous mixture
(C)compound
D) homogeneous mixture

Answers

Answer:

solution is a homogeneous mixture of two or more component

Answer:

B) heterogeneous mixture

Explanation:

Oxygen gas, generated by the reaction 2KClO3 (s) 2KCl(s) 3O2 (g) is collected over water at 27°C in a 1.35-L vessel at a total pressure of 1.00 atm. (The vapor pressure of H2O at 27°C is 26.0 torr.) How many moles of KClO3 were consumed in the reaction?

Answers

Answer:

[tex]n_{KClO_3}=0.0353molKClO_3[/tex]

Explanation:

Hello!

In this case, according to the experiment, we first realize that the pressure of oxygen is:

[tex]p_{O_2}=1.00atm-26.0/760 atm=0.966atm[/tex]

Next, we compute the moles based off the ideal gas law:

[tex]PV=nRT\\\\n=\frac{PV}{RT}=\frac{0.966atm*1.35L}{0.08206\frac{atm*L}{mol*K}*300K}=0.0530molO_2[/tex]

Thus, since there is 3:2 mole ratio between oxygen and potassium chlorate, we can compute the consumed moles of the latter as shown below:

[tex]n_{KClO_3}=0.0530molO_2*\frac{2molKClO_3}{3molO_2} \\\\n_{KClO_3}=0.0353molKClO_3[/tex]

Best regards!

Which statement describes steps involved in the production of hydroelectric power?
A. Falling water turns a turbine that helps generate electricity.
B. Moving water turns a paddle wheel that helps generate electricity.
C. Water falls down a pipe to generate electricity.
D. Potential energy of water is directly transformed into electrical energy.

Answers

A. Falling water turns a turbine that helps generate electricity

C5H12 + O2 = CO2 + H2O
If 84.3 grams of C5H12 react according to the above equation and the % yield is 94% find the actual yield of grams of carbon dioxide

Answers

Answer: 241.6 grams of CO2

Explanation: you take 84.3 grams C5H12 and divide it by 72.15 grams of C5H12(which is the molar mass) you take that answer and calculate the mols of CO2 by multiplying the 1.168 you got before and multiply it by 5. You take the answer you get from that and multiply it by the molar mass of CO2 and get the theoretical yield and then you just plug it in. 94= (x/257.02)x100 and solve to find x which is the actual yield.

Psychology **

Richard often has hallucinations of his father who has passed away and has delusions that he is under constant government surveillance. What
is Richard likely to be suffering from?
A anxiety disorder
OB. personality disorder
OC, mood disorders
OD
schizophrenia

Answers

the answer is schizophrenia!

Answer:

Explanation:

The energy associated with a current is called____________

(A) mechanical energy
(B) magnetism
(C) geothermal energy
(D) electrical energy

Answers

Answer:

D. Electrical energy

Explanation:

I assume you are talking about an electrical current.

(These are by what I know and are simplified, not an exact definition)

A. Mechanical energy is energy that something has because of motion.

B. Magnetism is the attracting and repulsing forces between magnets.

C. Geothermal energy is heat inside of the Earth. Used as source of power.

D. Electrical energy is the result of an electric charge.

Why is the average air temperature of Makassar warmer than the average air
temperature of Chirstchurch?

Answers

Answer:

becuase of the sun

in different places some places would be cold

An atom of carbon contains 6 total electrons. How many of these electrons are in s orbitals?
1
2
4
6

Answers

Answer:

Explanation:

total electrons = 6

electronic configuration = 1s^2, 2s^2, 2p^6

so in s orbital there are 4 electrons.

Hope it helps you (｡◕‿◕｡)

Which periodic table has the elements placed in locations that match the information on the flash card?

Answers

Answer:

https://quizizz.com/admin/quiz/5902a3fd8d05b2100088880a/cat-1-chemistry-review

Explanation:

Answer:

atomic? hope this helps!

Explanation:

why a “control” is important in a case-control study of a disease?

Answers

Answer:

Explanation:

Purpose of Case Control Studies

To determine whether or not an association exists between a disease and a particular risk factor. To start with a group of people with disease and work back to see whether a possible risk factor may be the cause. It may be the first step in testing a hypothesis.

To assess whether an association between a disease and a specific risk factor exists or not. Starting with a group of people with illness and working back to see if the cause could be a potential risk factor. In testing a hypothesis, this may be the first step.

Buffers are substances that help resist shifts in pH by Question 10 options: 1) releasing H in acidic solutions. 2) donating H to a solution when they have been depleted. 3) releasing OH- in basic solutions. 4) accepting H when the are in excess. 5) donating H to a solution when they have been depleted and accepting H when the are in excess.

Answers

Answer:

5) donating H to a solution when they have been depleted and accepting H when they are in excess.

Explanation:

A buffer solution is a solution that undergoes a negligible change in pH in addition of moderate quantities of acid or alkali. In other words, a buffer solution is one that resists a change in pH on addition or dilution of small amounts of acids or alkalis.

So, from the given question:

Buffers are substances that help resist shifts in pH by donating H to a solution when they have been depleted and accepting H when they are in excess.

determine the empirical and molecular formulas of a compound that gives the following analysis in math percent: 24.27% C,4.07% H, and 71.65%CL. the molar mass is known to be 197.92g/mol.

Answers

Answer:

help me with this

Explanation:

Me without you is like a nerd without braces, A shoe without laces, aSentenceWithoutSpaces.

Answers

Answer:

LOL

Explanation:

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