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Naya [18.7K]
3 years ago
11

The statements in the table summarize what Johannes Kepler stated in the early 1600s about the motion of planets.

Chemistry
2 answers:
Alisiya [41]3 years ago
6 0

C.) the answer is laws

Murrr4er [49]3 years ago
3 0
<h2>Answer : Option C) Laws</h2><h3>Explanation : </h3>

The statements in this table has summarized the Johannes Kepler law's about the motion of planets. Over the last four hundred years, these predictions of laws have proven to be true.

A law is generalized rule which explains a body of observations in the form of a verbal or mathematical statement.

Similarly, scientific laws which are also known as natural laws are considered to be laws because they imply a cause and effect between the observed elements and is observed to the same conditions always.

This proved to be true for the statements made by Kepler. Hence, this can be classified as laws.

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∆G° for the reaction of nitrogen with hydrogen to produce ammonia (see balanced chemical equation below) has a value of -33.3 kJ
Juliette [100K]

Answer:

-0.85KJ

Explanation:

Given N2(g) + H2(g) <--->2NH3(g)

Kp =[ P(NH3)]²/[P(H2)]³[P(N2)]

Where P is the pressure of the gas

P(H2)b= P(N2) = 125atm

P(NH3) = 200atm

Kp = 2²/(125)³(125)

Kp = 2.048 ×10^-6

∆G = -RTlnKp

R =0.008314 J/Kmol

T = 25 +273/= 298k

= 8.314 ×10^-3 × 298 × ln(2.048 ×10^-6)

= -0.008314 × 298 × (-13.099)

= 32.45KJ

∆G = ∆G° + RTlnKp

∆G = -33.3 + 32.45

∆G = -0.85KJ or -850J

3 0
4 years ago
Hydrogen has 3 isotopes 1 H 2 H and 3 H. What is the difference between these 3 isotopes
Anarel [89]

Answer:

See below.

Explanation:

1 H (hydrogen) has  a nucleus of just 1 proton.

2 H (deuterium)  has a nucleus of 1 proton and 1 neutron

3 H (tritium) has a nucleus of 1 proton and 2 neutrons.

5 0
3 years ago
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Is volume and mass size-dependent
Otrada [13]
A size dependent property is a physical property that changes when the size of an object changes.
6 0
3 years ago
What is the entropy change for freezing 2.71 g of C2H5OH at 158.7 K? ∆H = −4600 J/mol. Answer in units of J/K.
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Answer:

-1.71 J/K

Explanation:

To solve this problem we use the formula

ΔS = n*ΔH/T

Where n is mol, ΔH is enthalpy and T is temperature.

ΔH and T are already given by the problem, so now we calculate n:

Molar Mass C₂H₅OH = 46 g/mol

2.71 g C₂H₅OH ÷ 46g/mol = 0.0589 mol

Now we calculate ΔS:

ΔS = 0.0589 mol * −4600 J/mol / 158.7 K

ΔS = -1.71 J/K

4 0
3 years ago
Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?
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Answer:

C) Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.

Explanation:

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3 years ago
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