0.68 moles of calcium to calcium atoms​

Answers

Answer 1

[tex]0.68 \: moles \: calcium \times \frac{6.02 \times {10}^{23} \: calcium \: atoms }{1 \: mole \: calcium} \\ [/tex]

The (( mole calcium ))s are simplified so the answer is based on the number of calcium atoms.

[tex]0.68 \times 6.02 \times {10}^{23} = 68 \times {10}^{ - 2} \times 602 \times {10}^{ - 2} \times {10}^{23} \\ [/tex]

[tex] = 68 \times 602 \times {10}^{ - 4} \times {10}^{23} = 40936 \times {10}^{19} \\ [/tex]

[tex] calcium \: atoms = 40936 \times {10}^{19} \\ [/tex]

_________________________________

And we're done.

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Related Questions

Help me please answer this with solution....A piece of granite weighing 250g is heated in a boiling water to 100°C. When a granite is place in a calorimeter containing 400g water, the temperature of the water increases from 20°C to 28.5°C. What is the specific heat of the granite, assuming all the heat is transferred to the water?​

Answers


heat lost by granite + heat gained by H2O = 0

[mass granite x specific heat granit x (Tfinal-Tinitial)] + [mass H2O x specific heat H2O x (Tfinal-Tinitial)] = 0
Substitute and solve for specific heat granite, the only unknown.

The specific heat capacity of the granite is 0.796 J/gºC

We'll begin by calculating the heat absorbed by the water. This can be obtained as follow:

Mass of water (M) = 400 g

Initial temperature of water (T₁) = 20 °C

Final temperature (T₂) = 28.5 °C

Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 20 = 8.5 °C

Specific heat capacity of water (C) = 4.184 J/gºC

Heat absorbed (Q) =?

Q = MCΔT

Q = 400 × 4.184 × 8.5

Q = 14225.6 J

Thus, the heat absorbed by the water is 14225.6 J

Finally, we shall determine the specific heat capacity of the granite

Heat absorbed = Heat released

Heat absorbed = 14225.6 J

Heat released = –14225.6 J

Mass of granite (M) = 250 g

Initial temperature of granite (T₁) = 100 °C

Final temperature (T₂) = 28.5 °C

Change in temperature (ΔT) = T₂ – T₁ = 28.5 – 100 = –71.5 °C

Specific heat capacity of granite (C) =?

Q = MCΔT

–14225.6 = 250 × C × –71.5

–14225.6 = –17875 × C

Divide both side by –17875

C = –14225.6 / –17875

C = 0.796 J/gºC

Therefore, the specific heat capacity of the granite is 0.796 J/gºC

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Help me out i don’t not understand this

Answers

Explanation:

hope this helps!!! happy learning!!!!

why is earth often referd as a blue planet ?

A-When viewed from space, the biosphere always looks blue.

B-Most people like blue.

C-The sky is blue.

D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.

NEED ANSWER ASAP

Answers

The earth is often referred as a blue planet because the hydrosphere looks blue and it covers 3/4 of the earths surface. So the answer is D

Answer:

D-The hydrosphere looks blue and covers three-fourths of the Earth’s surface.

Explanation:

three students measured the volume of water with three different devices they report the volumes
large cylinder 164 ml
small cylinder 39.7 ml
calibrated buret 18.16 ml

if they pour it into a single container what is the volume​

Answers

Answer:

The total volume of water is 222 ml.

Explanation:

Given that,

Volume of water by  different devices are,

First large cylinder =164 ml

Second small cylinder = 39.7 ml

Third calibrated burette = 18.16 ml

We need to calculate the total volume of water

Using given data

volume of total water=volume by large cylinder+volume by small cylinder+volume by calibrated burette

Put the value into the formula

[tex]V_{w}=164+39.7+18.16[/tex]

[tex]V_{w}=221.8\approx 222\ ml[/tex]

Hence, The total volume of water is 222 ml.

The density of aluminum is 2.7 g/cm3. A metal sample has a mass of 52.0 grams and a volume of 17.1 cubic centimeters. Could the sample be aluminum? EXPLAIN your answer.

Answers

Answer:

The given metal sample is not aluminum because its density is 3.0 g/cm³ while density of aluminum is  2.7 g/cm³.

Explanation:

Given data:

Density of aluminum = 2.7 g/cm³

Mass of metal sample = 52.0 g

Volume of metal sample = 17.1 cm³

which sample is that = ?

Solution:

The given problem will be solve through density formula.

d = m/v

d = density

m = mass

v= volume

Now we will put the values in formula.

d = 52.0 g/ 17.1 cm³

d = 3.0 g/cm³

It is given in question the density of aluminum is 2.7 g/cm³. The given metal sample is not aluminum because its density is 3.0 g/cm³.

write 0.006 in exponential form​

Answers

[tex]\huge\pink{Answer}[/tex]

0.0006 in scientific notation is 6 × 10-4

Step by step Explanation:

All numbers in scientific notation or standard form are written in the form

m × 10n, where m is a number between 1 and 10 ( 1 ≤ |m| < 10 ) and the exponent n is a positive or negative integer.

To convert 0.0006 into scientific notation, follow these steps:

Move the decimal 4 times to right in the number so that the resulting number, m = 6, is greater than or equal to 1 but less than 10

Since we moved the decimal to the right the exponent n is negative

n = -4

Write in the scientific notation form m × 10n

= 6 × 10-4

Therefore,

6 × 10-4 is the scientific notation form of 0.0006 number and 6e-4 is the scientific e-notation form for 0.0006

HOPE IT HELPS ☺️

The world map below shows the locations of San Francisco and Dublin which of these statements best explains why Dublin is not cooler than San Francisco although it is over 1600 km further north?

Answers

Answer:

Dublin is warmed by ocean currents.

Explanation:

Got it right on test

Answer:

B.  Dublin is warmed by ocean currents.

Explanation:

which of the following substance is an element?
A. Air
B. Iron
C. Salt
D. Sugar​

Answers

Answer:

B. Iron

Explanation:

It is element number 26 on the periodic table.

Answer:

Iron is an element because it is a pure substance, air is a mixture, salt and sugar are compounds.

The gas cyclobutane, C4H8(g), can be used in welding. When cyclobutane is burned in oxygen, the reaction is: C4H8(g) + 6 O2(g)4 CO2(g) + 4 H2O(g) (a) Using the following data, calculate ΔH° for this reaction. ΔH°f kJ mol-1: C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ (b) Calculate the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 (c) When this reaction is carried out in an open flame, almost all the heat produced in part (a) goes to raise the temperature of the products. Assuming that the reactants are at 25°C, calculate the maximum flame temperature that is attainable in an open flame burning cyclobutane in oxygen. The actual flame temperature would be lower than this because heat is lost to the surroundings. Maximum temperature = °C

Answers

Answer:

a

[tex]\Delta H^o _{rxn} = -2568.9 \  kJ [/tex]

b

[tex]H  = 350 JK^{-1}[/tex]

c

[tex]T_{max}  = 32.4 ^o C[/tex]

Explanation:

From the question we are told that

 The reaction of cyclobutane and oxygen is

         [tex]C_4H_8_{(g)} + 6 O_2_{(g)} \to 4 CO_2_{(g)} + 4 H_2O_{(g)}[/tex]

ΔH°f (kJ mol-1) : C4H8(g) = 27.7 ; CO2(g) = -393.5 ; H2O(g) = -241.8 ΔH° = kJ

Generally ΔH° for this reaction is mathematically represented as

      [tex]\Delta H^o _{rxn} = [[4 * \Delta H^o_f (CO_2_{(g)} ) + 4 * \Delta H^o_f(H_2O_{(g)} ] -[\Delta H^o_f (C_2H_6_{(g)} + 6 * \Delta H^o_f (O_2_{(g)}) ] ][/tex]

=>  [tex]\Delta H^o _{rxn} = [[4 * (-393.5) + 4 * (-241.8) ] -[ 27.7 + 6 * 0][/tex]

=>  [tex]\Delta H^o _{rxn} = -2568.9 \  kJ [/tex]

Generally the total heat capacity of 4 mol of CO2(g) and 4 mol of H2O(g), using CCO2(g) = 37.1 J K-1 mol-1 and CH2O(g) = 33.6 J K-1 mol-1. C = J K-1 is  mathematically represented as

     [tex]H  = [ 4 * C_{CO_2_{(g)}} + 6* C_{CH_2O_{(g)}}][/tex]

=>  [tex]H  = [ 4 * 37.1 + 6* 33.6 ][/tex]

=>   [tex]H  = 350 JK^{-1}[/tex]

From the question the initial temperature of reactant is  [tex]T_i  =  25^oC[/tex]

Generally the enthalpy change([tex]\Delta H^o _{rxn}[/tex]) of the reaction is mathematically represented as

 [tex]|\Delta H^o _{rxn} |=  H  * (T_{max} -T_i)[/tex]

  [tex]  2568.9 =   350  * (T_{max} -25)[/tex]  

=> [tex]\frac{2568.9 }{350}  =  T_{max} - 25[/tex]

=> [tex]T_{max}  = 32.4 ^o C[/tex]

   

A ______________________ is required to cause atoms to bond together or be separated from one another. *
a physical change
b phase change
c radioactive decay
d chemical reaction

Answers

Answer:

d chemical reaction..

What do you notice about the relationship between the force strength and the size of the velocity change?

Answers

Answer:

fkv  SFHHHHHHHHHCB FSSSSZCHJjjjb .SFFHHHHHHHHC

Explanation:

What do you notice about the relationship between the force strength and the size of the velocity change?

Uuuuuuu

what does the o in chemistry mean?

Answers

oxygen
look at the periodic table and it says it

Answer:

oxygen

Explanation:

periodic table

Help pls 100 points and brainiest

Answers

Answer:

See below

Explanation:

INdependent = amount of med given

Dependent = recovery time    <==== this 'depends' on the amount of medicine given

A 10.0-g sheet of gold with a temperature of 18.0°C is laid flat on a sheet of iron that weighs 20.0 g and has a temperature of 55.6°C. Given that the specific heats of Au and Fe are 0.129 J g-1 0 c-1 and 0.444 J g-1 0 c-1, respectively, what is the final temperature of the combined metals? Assume that no heat is lost to the surroundings. (Hint: The heat gained by the gold must be equal to the heat lost by the iron.)

Answers

Answer:

T = 50.83°C

Explanation:

Let the final temperature be T .

heat lost = mass x specific heat x fall in temperature

heat lost by iron = 20 x .444 x ( 55.6 - T )

heat gained  by gold  = 10 x .129 x ( T- 18 )

heat lost = heat gained

20 x .444 x ( 55.6 - T ) = 10 x .129 x ( T- 18 )

493.73 - 8.88 T = 1.29 T - 23.22

10.17 T = 516.95

T = 50.83°C

The final temperature of the combined metals (gold and iron) is 50.83°C.

Given the following data:

Initial temperature of gold = 18.0°CFinal temperature of iron = 55.6°CMass of gold = 10.0 gMass of iron = 20.0 gSpecific heat capacity of iron = 0.444 J/g°C.Specific heat capacity of gold = 0.129 J/g°C.

To find the final temperature of the combined metals (gold and iron):

Heat lost by the iron = Heat gained by the gold.

[tex]Q_{lost} = Q_{gained}\\\\mc\theta = mc\theta\\\\20(0.444)(55.6 - T_f) = 10(0.129)(T_f - 18)\\\\8.88(55.6 - T_f) = 1.29(T_f - 18)\\\\493.728 - 8.88T_f = 1.29T_f - 23.22\\\\8.88T_f + 1.29T_f = 493.728 + 23.22\\\\10.17T_f = 516.948\\\\T_f = \frac{516.948}{10.17}[/tex]

Final temperature = 50.83°C

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What do metalloids and non metals have in common

Answers

Answer:

Metalloids are brittle like Non-Metals

Explanation:

PLEASE HELP ME
For which of the following reactions is ΔH∘rxn equal to ΔH∘f of the product(s)? You do not need to look up any values to answer this question.

Check all that apply.
H2(g)+12O2(g)→H2O(g)
Li(s)+12F2(g)→LiF(s)
2Li(s)+F2(g)→2LiF(s)
Li(s)+12F2(l)→LiF(s)
2H2(g)+O2(g)→2H2O(g)
H2O2(g)→12O2(g)+H2O(g)

Answers

Answer:

Explanation:

Li(s)+1/2 F₂(g)→LiF(s)

In this reaction one mole of product is formed from gaseous state of reactants . So this reaction will represent the reaction for which ΔH∘rxn equals to ΔH∘f .

In other reaction one mole is not produced if we balance the reaction. The reactant must be in gaseous state .  ΔH∘f . represents heat of formation .  ΔH∘rxn represents heat of reaction .

The is the
variable that
gets measured

Answers

Answer:

what? what's the full question?

Question 3 of 8
Which two characteristics are needed to describe a force?
A. Direction
B. Speed
C. Resistance
D. Size
SUBT

Answers

Answer:A. Direction

C. Resistance

Explanation:

Forces are due to an interaction of at least two objects. It may change the state of motion of an object. It may change the shape of an object. Forces applied on an object in the same direction add to one another and the resultant is in the same direction.

plz mark brainliest

Which of these is the smallest?


cells

atoms

molecules

cell membranes


Science 7th grade

Answers

the smallest is atoms :)

Answer: atoms

Explanation: cell membrane is in a cell

What is a faze of matter

Answers

Answer:

solider liquid and gas plasma

Explanation:

in physical a state of matter is one of the distant form in which matter can exist four states of matter are observable in everyday life solid liquid and gas and plasma. hope it helps

In physics, a state of matter is one of the distinct forms in which matter can exist. Four states of matter are observable in everyday life: solid, liquid, gas, and plasma.

What is the concentration of a dextrose solution prepared by diluting 15 mL of a 1.0 M dextrose solution to 25 mL using a 25 mL volumetric flask

Answers

Answer:

C₂ = 0.60 M

Explanation:

Step 1: Given data

Concentration of the concentrated solution (C₁): 1.0 MVolume of the concentrated solution (V₁): 15 mLConcentration of the diluted solution (C₂): ?Volume of the diluted solution (V₂): 25 mL

Step 2: Calculate the concentration of the diluted dextrose solution

We will use the dilution rule.

C₁ × V₁ = C₂ × V₂

C₂ = C₁ × V₁ / V₂

C₂ = 1.0 M × 15 mL / 25 mL

C₂ = 0.60 M

How many days are in 5.75 weeks?

Answers

Answer:

There are 40.25 days in 5.75 weeks

Answer: 40.25

Hope this helped! :)

What is the molar mass of Mg(ClO4)2?

Answers

Answer:

223.21 g /mol

Explanation:

To find the molar mass (g/mol) of a substance, you have to add the amu's of all the elements together. First you have to determine how of element there are:

Mg=1, Cl=2, O=8.     Now you multiply the amu of each element by the number of elements in the compound. Then add them together. The amu of an element and its molar mass are the same.

1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol) = 223.31 g/mol

223.31 g/mol is the molar mass of the given compound. The molar mass of a material is a bulk attribute rather than a molecular one.

The ratio among the mass with the quantity of a substance (measured in mole) of any sample of a chemical compound is known as the molar mass (M) in chemistry. The compound's molar mass represents an average over numerous samples, which frequently have different masses because of isotopes. A terrestrial average as well as a function of the relative distribution of the isotopes of the component atoms on Earth, the molar mass is most frequently calculated using the standard atomic weights.

Molar mass=1(24.31 g/mol) + 2(35.45 g/mol) + 8(16.00 g/mol)

= 223.31 g/mol

To know more about molar mass, here:

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One isotope of Carbon(C) has exactly the same mass number and atomic mass since it was used as the definition of the atomic mass unit. Which isotope is it and what is it’s atomic mass?

Answers

Carbon-12

hope this helps have a great day !

Which example describes a use for gemstones?

fabrics
plastics
drill bits
paper clips



I will give Brainlyest

Answers

Answer:

drill bits

Explanation:

I don't think that you would use gemstones in anything else.

A purified protein has a molecular mass of 360 kDa when measured by size exclusion chromatography. When analyzed by gel electrophoresis in the presence of SDS, three bands are observed, with molecular masses of 160, 140, and 60 kDa. When gel electrophoresis is carried out in the presence of SDS and dithiothreitol, three bands are once again observed, with molecular masses of 140, 80, and 60 kDa. What is the subunit composition of the protein?

Answers

Answer:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

Explanation:

Given that:

A protein has four subunits whose molecular masses are 140, 80, and 60 kDa.

A disulfide bond links the two 80 kDa subunits (possibly identical).

As a result of SDS and dithiothreitol analysis treatment, the molecular masses can not be 360 in total. They are 280, which implies that they are in short of 80 kDa. This means that there are possibilities that two groups with a molecular mass of 80 kDa which are joined by a disulfide bond.

The presence of SDS and dithiothreitol acts as a reducing agent, and they can break disulfide bonds whose pH is greater than 7, i.e. those in basic condition.

Which factor is most important to consider when evaluating a journal article about global warming? Is the article long enough? Does the article contain facts or only opinions? Did the author of the article use complex, scientific words? Does the author of the article have a doctorate degree?

Answers

Answer:

Does the article contain facts or only opinions

Got it right on edg.

Answer:

B) Does the article contain facts or only opinions?

Explanation:

Q1. Why is Cl2 a nonpolar molecule, but HCl is a polar molecule? Explain your reasoning.​

Answers

Answer:

\/\/

Explanation:

in CI2 the electron charge is identical on both atoms but on HCI electrons are shared unequally between the chlorine atoms and hydrogen atoms

Test (Speed, Velocity and Acceleration)
A dog can run as fast as 15 miles per hour for a short distance. If a dog ran at this speed 0.10 of an hour, how far would it run?

Answers

Answer:

1.5 miles

Explanation:

Given that,

Speed of dog, v = 15 mph

Time taken by the dog, t = 0.1 h

We need to find the distance travelled by the dog. We know that, distance is the product of speed and time. So,

d=vt

[tex]d=15\times 0.1\\\\d=1.5\ \text{miles}[/tex]

Hence, the dog will cover a distance of 1.5 miles.

Question 3 (12 points)
The core becomes a
a hot, dense, slowly cooling sphere of carbon.
Оа
red dwarf

Answers

Answer:

c

Explanation:

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