CHEMISTRY HIGH SCHOOL

Calculate the molar mass
FeCl3
Fe2(SO4)3
PbO
PbO2
Pb3O4

Answers

Answer 1
Answer: To find molar mass: look for each element on the table and find their atomic masses. Then add each atomic mass to find the molar mass. If there is a subscript then that means that there is 3 of that number. For atomic mass round to the nearest hundredths
FeCl3= 162.2
Fe2(SO4)3= 354.88
PbO=223.2
PbO2 = 239.2
Pb3O4=685.6

Related Questions

Which of these is NOT a physical property of matter?A) odor B) boiling point C) melting point D) ability to rust
What are the two parts of an atom?
A 5.00L balloon filled with 1.00 moles of O2 gas contains a total of how many liters?
What is the pH of a Koh solution that has [H+]=1.87×10^-13M
Mg(s) + Cu(NO3)2(aq) → Mg(NO3)2(aq) + Cu(s) what is the oxidizing agent and the reducing agent

I have added 12.0 L of air.To a balloon at sea level(760 torr). If I take the ballon with me to Colorado, where the air pressure is 0.650 atm, what will the new volume of the balloon be?

Answers

Answer:

18.46 L

Explanation:

From the question given above, the following data were obtained:

Initial volume (V1) = 12.0 L

Initial pressure (P1) = 760 torr

Final pressure (P2) = 0.650 atm

Final volume (V2) =..?

Next, we shall express the pressure in the same unit of measurement.

Thus, 760 torr is equivalent to 1 atm.

Finally, we shall the new volume of the balloon as follow:

Initial volume (V1) = 12.0 L

Initial pressure (P1) = 1 atm

Final pressure (P2) = 0.650 atm

Final volume (V2) =..?

P1V1 = P2V2

1 × 12 = 0.650 × V2

12 = 0.650 × V2

Divide both side by 0.65

V2 = 12/0.65

V2 = 18.46 L

Therefore, the new volume of the balloon is 18.46 L.

Another word or phrase for moon

Answers

scientific name is satellite i think..

Which of the following types of radiation can be shielded by piece of paper or fabric

Answers

There are 3 major types of radiation. The Alpha, Beta and Gamma radiation. It is the Alpha radiation that can be stopped by a piece of paper or fabric. Beta on the other hand can be stopped by plastic or a thin sheet of metal and Gamma by a piece of aluminum foil or lead. 

Why is crushed ice used for snow cones? a) decreasing the pressure helps dissolve more flavoring
b) increasing the temperature helps dissolve more flavoring
c) increasing the surface area helps dissolve more flavoring
d) decreasing agitation helps dissolve more flavoring

Answers

The reason for crushing ice for snow cones is C) increasing the surface area helps dissolve more flavoring. The amount of flavoring absorbed depends on the temperature and the surface area of contact. Because the temperature can not be increased without melting the ice, the ice is crushed. This increases its surface area and more flavoring is dissolved.
The answer to the question is C, increasing the surface area helps dissolve more flavoring. The motivation behind why squashed ice utilized for snow cones is a direct result of expanding the surface range breaks down all the more enhancing. The snow cone is a cone-molded paper glass that contains little bits of ice enhanced with a sweet syrup.

An igneous rock originally has 3 grams of uranium 238 in it. When dated the rock only contains 1.8 grams. What are the parent and daughter concentrations (in percentages) and what is its age?

Answers

Answer :

The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.

The age of rock is 3.32* 10^9\text{ years}

Explanation :

First we have to calculate the parent and daughter concentrations (in percentages).

\text{Parent concentrations}=(1.8g)/(3g)* 100=60\%

and,

\text{Daughter concentrations}=((3-1.8)g)/(3g)* 100=40\%

As we know that, the half-life of uranium-238 = 4.5* 10^9 years

Now we have to calculate the rate constant, we use the formula :

k=(0.693)/(t_(1/2))

k=\frac{0.693}{4.5* 10^9\text{ years}}

k=1.54* 10^(-10)\text{ years}^(-1)

Now we have to calculate the time passed.

Expression for rate law for first order kinetics is given by:

t=(2.303)/(k)\log(a)/(a-x)

where,

k = rate constant  = 1.54* 10^(-10)\text{ years}^(-1)

t = time passed by the sample  = ?

a = initial amount of the reactant  = 3 g

a - x = amount left after decay process = 1.8 g

Now put all the given values in above equation, we get

t=(2.303)/(1.54* 10^(-10))\log(3)/(1.8)

t=3.32* 10^9\text{ years}

Therefore, the age of rock is 3.32* 10^9\text{ years}

Oxygen, nitrogen, and carbon are all ___________________.

Answers

Organic elements, depends on the context of the question but I suspect that is the answer. The organic elements are H,O,C,N,P,S
Other Questions
The two classifications of all chemicals are organic and salts. a. True b. False
What is the gram formula mass of Ca3(PO4)2
Doing science, and having a bit of trouble.please helpthank you so much!
What is the result of adding KF to an equilibrium mixture of the weak acid HF?HF(aq)⇔H+(aq)+F-(aq).a. F- concentration decreasesb.the dissociation constant, K, increasesc. HF concentration decreasesd. H+ concentration decreases