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Vera_Pavlovna [14]
3 years ago
14

WILL MAKE BRAINEST

Chemistry
1 answer:
Elanso [62]3 years ago
8 0
V=84.0 mL = 84.0 cm³
m=609.0 g

p=m/v

p=609.0/84.0=7.25 g/cm³
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What is the answer to SiO2 + C --> Si + CO
Inessa05 [86]

Answer:

SiO2 + 2C - - > Si + 2CO

Explanation:

Everything should balance out now. The same number of atoms of each kind on each side

8 0
4 years ago
The elementary gas-phase reaction (ch3)3cooc(ch3)3→c2h6+2ch3coch3 is carried out isothermally in a flow reactor with no pressure
oee [108]
When: (CH3)3COOH(CH3)3⇒ C2H6 + 2CH3CoCH3 
                       A                            B                 2C
SO first for A:
When feed rate to reactor = FA(o), and Effluent rate from reactor= FA=Fa(o)(1-x)

Second for B:
When feed rate to reactor = 0, and Effluent rate from reactor FB= FA(o)X

Third for C:
When feed rate tp reactor = 0, and the Effluent rate from reactor FC= 2FA(o)X

So, the total feed rate to reactor FT(o) = FA(o)
and the total Effluent rate from reactor FT = FA(o)(1+2X)
For the CSTR:
V= FA(o) X / γa where -γ = KCA

We can get the total concentration at any point CT and the entrance CT(o) from this equation:
CT= FT/Q= P/ZRT
and CT(o) = FT(o)/ Q(o) = P(o)/ Z(o)RT(o)

We can neglect the changes in Z (the compressibility factor) So:
Q = Q(o) FT/FT(o) P(o)/P T/T(o)
Because there is no pressure drop and for the isothermal system we can assume P & T are constants:
∴ Q = Q(o) FT/ FT(o) 
∴ CA = FA / Q = (FA(o)(1-X)) / (Q(o)(1+2X))
                        = CA(o)((1-X)/(1+2X)) -----> eq 1
When K (the reaction rate constant) at 127C° can be evaluated with R (the gas constant)  8.314 J/mole.K° = 0.08205 L.atm/mole.°K

When, K2=K1(exp)[E/R ( (1/T1) - (1/T2)]
when T1 by kelvin = 50+273= 323 K° and T2= 127+273 = 400 K° 
and activition energy = 85 KJ/mol = 85000 J/mol
       ∴     K2   =10^-4 (exp) [85000/8314 ((1/323) - (1/400)] = 0.0443 min^-1 
We can get the concentration of (A) at 10 atm and 127C° (400K°) by:

CA(o)= PA(o) /RT = 10 / ( 0.08205 * 400 ) = 0.305 mol / L

∴ The reactor volume of the CSTR is:
V = FA(o)X / KCA---> eq 2 
by substitute eq 1 in eq 2
∴ V=[ FA(o)x * (1+2x)] / [ KCA(o) * (1-X) ] 
      = [ 2.5 * 0.9 * (1+1.8)] / [0.0443 * 0.305* 0.1]
     = 4662.7 L
- The equilibrium conversion:
according to the reaction:
                       A⇔B + 2C
and we have:
-γ = KfCA - Kb CB( C(C)^2) = 0 and KC = Kf / Kb = (CB* CC^2)/ CA= 0.025(as it is agiven)

∴[ ( XCA(o) ) ( 2XCA(o)^2 ) ] / [ (1+2X)^2 * CA(o) * (1-X) ] = 0.025
 
when we have CA(o) (the initial concentration)= 0.305 mol/L, So we have this eq:
[(XCA(o)) (2XCA(o))^2] / [(1+2X)^2 CA(o) (1-X) ] = 0.025
 By the matlab function solve
∴ X= X eq = 0.512 for 90% of the equilibrium conversion
∴ X= 0.9 X eq =  0.4608




        





8 0
4 years ago
Location E is located at the Tropic of Cancer, while location F is at the equator. Which location is likely to be warmer at the
Stells [14]

The answer is "Location E, because Earth's axis is tilted towards the sun" :D

6 0
2 years ago
Note the molecular mass of a copper(I) oxide molecule in the image below. What is the mass of 8.250 moles of Cu2O?
xz_007 [3.2K]

Answer : The mass of copper(I) oxide is, 1180.5 grams.

Explanation : Given,

Moles of copper(I) oxide = 8.250 mol

Molar mass of copper(I) oxide = 143.09 g/mol

Formula used:

\text{ Mass of copper(I) oxide}=\text{ Moles of copper(I) oxide}\times \text{ Molar mass of copper(I) oxide}

Now put all the given values in this formula, we get:

\text{ Mass of copper(I) oxide}=(8.250moles)\times (143.09g/mole)=1180.5g

Therefore, the mass of copper(I) oxide is, 1180.5 grams.

5 0
3 years ago
Which student is determining the atomic mass of sodium?
Elden [556K]
<span>Find the elements sodium, oxygen, and phosphorus on the periodic table. Describe the monoatomic ions each would form. Then, given what you know about chemical bonding, describe and give the formulas for the types of ionic compounds they would produce with each other. </span>
8 0
4 years ago
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