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o-na [289]
3 years ago
11

Why are there fossils in sedimentary rocks?

Chemistry
1 answer:
melomori [17]3 years ago
8 0

Answer: Because, they form at temperatures and pressures that do not destroy fossil remains.

Explanation:

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Kc for the reaction of hydrogen and iodine to produce hydrogen iodide.
tatiyna

Answer:

[H_2]_{eq}=0.183M

[I_2]_{eq}=0.183M

[HI]_{eq}=0.025M

Explanation:

Hello.

In this case, for this equilibrium problem, we first realize that at the beginning there is just HI, it means that the reaction should be rewritten as follows:

2HI\rightleftharpoons H_2+I_2

Whereas the law of mass action (equilibrium expression) is:

Kc=\frac{[H_2][I_2]}{[HI]^2}

That in terms of initial concentrations and reaction extent or change x turns out:

Kc=\frac{x*x}{([HI]_0-2x)^2}\\\\54.3=\frac{x^2}{(0.391M-2x)^2}

And the solution via solver or quadratic equation is:

x_1=0.183M\\\\x_2=0.210M

Whereas the correct answer is 0.183 M since the other value yield a negative concentration of HI at equilibrium (0.391-2*0.210=-0.029M).This, the equilibrium concentrations are:

[H_2]_{eq}=0.183M

[I_2]_{eq}=0.183M

[HI]_{eq}=0.391M-2*0.183M=0.025M

Regards.

6 0
3 years ago
Calculate the formula mass for each compound. a. NO2 b. C4H10 c. C6H12O6 60. Calculate the formula mass for each compound. a. Mg
joja [24]

Explanation:

The formula mass of a molecule (also known as formula weight) is the sum of the atomic weights of the atoms in the empirical formula of the compound.

a. NO2

N = 14

O = 16

NO2 = 14 + (16 * 2) = 46 amu

b. C4H10

Empirical formular = C2H5

C = 12

H = 1

C2H5 = (12*1) + (1*5) = 12 + 5 = 17 amu

c. C6H12O6

Empirical formular = CH2O

C = 12

H = 1

O = 16

C2H5 = 12 + (1*2) + 16 =  30 amu

d MgBr2

Mg = 24

Br = 80

MgBr2 = 24 + (80*2) = 184 amu

e. HNO2

H = 1

N= 14

0 = 16

HNO2 = 1 + 14 + (16*2) = 47 amu

f. CBr4

C= 12

Br = 80

CBr4 = 12 + (80*4) = 332 amu

g.  Cr(NO3)3

Cr = 52

N = 14

O = 16

Cr(NO3)3 = 52 + 3[14 + (3*16)] = 238 amu

3 0
3 years ago
A 1.0 liter flask contains 90.1 moles of water vapor at 27.0 oC. What is the pressure of the gas?
zmey [24]

Answer:

The pressure of the gas is 224839.8 atm

Explanation:

As we know

PV = nRT

Substituting the given values, we get -

P * 1 L = 90.1 moles * 8.314 4621(75). J K−1 mol−1 * 300

P = 224839.8 atm

The pressure of the gas is 224839.8 atm

5 0
3 years ago
Why do marshmallows puff up when microwaved more than any other food?
Kryger [21]
Marshmallows contain mostly  water and sugar. When microwaved, the water heats up, so do the air bubbles in the marshmallow, and they thus take more space. Since sugar tends to soften when heated up, the marshmallow's structure will puff up as the air bubbles expand.
5 0
3 years ago
Read 2 more answers
I need help please <33
Aliun [14]

Answer:

Option 3 is correct.

The atomic nucleus of each element has a unique number of protons. Therefore, the energy of the electron layers of the atoms of each element is unique.

If we have the energy released from each electron transfer between the layers of the atom, we can identify the element.

4 0
3 years ago
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