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2 years ago

I need help in this :(

Chemistry

1 answer:

alexandr402 [8]2 years ago

6 0

Answer:

ok follow me twitter dm me for answer The Kid D is my twitter

Explanation:

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What is a huge organic molecule composed of many smaller molecules called?

photoshop1234 [79]

Answer:

Macromolecules. A very large organic molecule composed of many smaller molecules, 1)Carbohydrates, 2)proteins, 3)lipids, 4)nucleic acids. Three of the four classes of macromolecules that are polymers. 1.Carbohydrates.

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3 years ago

Iron reacts slowly with oxygen and water to form a compound commonly called rust (Fe₂O₃?4H₂O). For 45.2 kg of rust, calculate

Mashcka [7]

Rust (Fe2O3. 4H2O) is formed when iron interacts slowly with oxygen and water. Mass of Fe in grams is 2.18 x 10⁴ g.

<h3>What is the explanation?</h3>

There are 2 moles of Fe atoms in 1 mole of Fe2O3-4H2O. The number of moles of Fe atoms in 45.2 kg rust is shown below.

Moles of Fe = 195.01 mol Fe₂O₃.4H₂O ( $\frac{2 mol Fe }{1 mol Fe₂O₃.4H₂O}$ )

Moles of Fe = 390.02 mol Fe

Multiply the calculated number of moles of iron, Fe, by its molar mass which is 55.85 $\frac{g}{mol}$

Mass of Fe = 390.02 mol Fe ( $\frac{55.85 g Fe}{mol Fe}$ )

Mass of Fe = 2.18 x 10⁴ g Fe

Avogadro's number (6.022 x 1023) of molecules (or formula units) make up one mole of a substance (ionic compound). The mass of 1 mole of a chemical is indicated by its molar mass. It provides you with the amount of grams per mole of a substance, to put it another way.

To learn more about moles visit:

brainly.com/question/26416088

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4 0

1 year ago

Match each type of reaction to its amount of potential energy. (PLEASE HELP )

sergejj [24]

Endo is more in reactants and exo is more in products because in exothermic reactions heat is released

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2 years ago

You just found a metallic object in a creek bed. You have found its mass to be 96.5 g, and it displaces 5 mL of water. What is t

LiRa [457]

I believe the substance would be gold.

8 0

3 years ago

Read 2 more answers

Consider a 0.12 M solution of a weak polyprotic acid (H2A) with the possible values of Ka1 and Ka2 given here. Calculate the con

tatuchka [14]

The [H3O+] in step 1 is 0.0034 M while the [H3O+] in step 2 is 0.00039 M

<h3>What is the contribution of each step?</h3>

Let us set up the ICE table in each case, for K1;

H2A(aq) + H2O(l)--------> H3O^+(aq) + HA^-(aq)

I 0.12 0 0

C -x +x +x

E 0.12 - x x x

Ka1= [H3O^+] [HA^-]/[ H2A]

Ka1= x^2/ 0.12 - x

1.0×10^−4 = x^2/ 0.12 - x

1.0×10^−4(0.12 - x ) = x^2

1.2 * 10^-5 - 1.0×10^−4x = x^2

x^2 + 1.0×10^−4x - 1.2 * 10^-5 = 0

x =0.0034 M

[H3O+] = 0.0034 M

Again; [H3O+] = [HA^-] = 0.0034 M

HA^-(aq) + H20(l) -------> A^-(aq) + H3O^+

I 0.0034 0 0

C -x + x +x

E 0.0034 - x x x

Ka2= [A^-] [H3O^+]/[HA^-]

5.0×10^−5 = x^2/ 0.0034 - x

5.0×10^−5 (0.0034 - x ) = x^2

1.7 * 10^-7 - 5.0×10^−5x = x^2

x^2 + 5.0×10^−5x - 1.7 * 10^-7 = 0

x=0.00039 M

Learn more about the dissociation of a polyprotic acid:brainly.com/question/14481763

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7 0

1 year ago