Question

hint: the answers are not molar mass! please show your work and explain

What is the mass of a **silicon dioxide** molecule
?

What is the mass of a **dinitrogen tetrafluoride**
molecule ?

What is the mass of a **carbon tetrabromide**
molecule ?

Answer #1

**1)**

**Sio2 molarmass = 60.08 g/mol**

**1 mol of any substance contains Na of molecules =
6.023*10^23 molecules**

**so that ,**

**mass of 1 SiO2 molecule =
60.08/(6.023*10^23)**

**
= 9.975*10^-23 g**

**2) N2F4 molarmass = 104.01 g/mol**

**so that,**

**mass of 1 N2F4 molecule =
104.01/(6.023*10^23)**

**
= 1.73*10^-22 g**

**3) CBr4 molarmass = 331.63 g/mol**

**so that,**

**mass of 1 CBr4 molecule =
331.63/(6.023*10^23)**

** = 5.5*10^-22
g**

PLEASE SHOW ALL WORK
Determine the molar mass of a solute if enough of it is added to
20 grams of benzene so that the total mass of the mixture is 22.5
grams and the freezing point is 3.5 degrees celcius. Assume that
the solute dissolves without dioociating into smaller pieces.

Consider a given volume of carbon dioxide gas at room
temperature (20.00C). (Molar Mass of Carbon dioxide is:
44.0 x 10-3 kg mol-1 J).
(i). Calculate the root-mean-square Speed, Vrms, of a
molecule of the gas?
The answer must be given in scientific notation and specified to
an appropriate number of scientific figures.
(ii). At what temperature would the root-mean-square-speed be
half of that at room temperature?
"Please read my complaint about the two previous answers given
to this...

Calculate the molar mass of a sample if a single molecule weighs
5.34 x 10^-23. _ Please show all work.

What is the molar mass of alum, AlK(SO4)2·12H20?
please explain.

Please show all of your work and explain your answers!
You have $200,000 available to invest. The risk-free rate of
return is 6% (you can borrow and lend at that rate of return). The
return on the risky portfolio is 17%. If you wish to earn a 21%
return, you should
__________ .
(a) invest $72,000 in the risk-free asset
(b) invest $70,000 in the risk-free asset
(c) borrow $70,000
(d) borrow $72,000
(e) no solution

Please show all work and place your final answers on the lines.
No work means no credit.(please show
work)
3. A trainer claims that he will increase your bench press
strength by 25 pounds. A random sample of 51 people that
have worked with the trainer showed a mean bench press strength
increase of 23 pounds with a standard deviation of 5
pounds. Using a significance level of 5%, can you
conclude that the trainer’s claim is valid?
Null Hypothesis:
____________________ Your
Work:...

Please show all work and place your final answers on the lines.
No work means no credit.(please show
work)
4. A sample of 300 UCI students showed 126 drink Blue Cow during
class while a sample of 400 UCLA students showed 152 drink Blue Cow
during class. Using a significance level of 5%, can you
conclude that the proportions of IUCI and UCLA students that drink
Blue Cow during class are the same?
Null Hypothesis: ____________________
Alternative Hypothesis: ____________________
Critical Value:...

n this week's experiment you will determine the molar mass of
carbon dioxide by measuring the mass of an Erlenmeyer flask full of
the gas. The following calculations are intended to familiarize you
with the general procedure:
The mass of an empty Erlenmeyer flask and stopper was determined to
be 58.85 grams. When filled with distilled water,
the mass was 303.4 grams. The atmospheric pressure
was measured to be0.9385 atm, the room temperature
was 20.00oC. At this temperature, the
vapor...

What mass of oxygen is needed for the complete combustion of 122
mL of
C6H6 (molar mass = 78.1 g/mol) to
produce carbon dioxide and water?
Density of C6H6 = 0.88 g/mL
2C6H6(l) +
15O2(g)
12CO2(g) +
6H2O(l)

LIMITING REAGENT PROBLEM: Show your work! PLEASE MAKE SURE IT IS
CLEAR HOW THE MOLES OF Ba3(PO4)2 and NaNO3 are found and be
descriptive with the entire process.
Consider the reaction and complete the following table:
2 Na3PO4 + 3 Ba(NO3)2 ----> Ba3(PO4)2 + 6
NaNO3
Initial Mass
100.0grams
100.0grams
-----------------
-----------
Change in Mass…. Amount used
or formed
Final mass
Molar Masses: Na3PO4 = 164 grams/mole Ba(NO3)2 = 261 grams/mole
Ba3(PO4)2 = 602 grams/mole NaNO3 = 85 grams/mole
b)...

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