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Anit [1.1K]
3 years ago
8

Use the periodic table entry below to answer the following question.

Chemistry
1 answer:
Komok [63]3 years ago
6 0
The answer is 59
the atomic mass is the number at the bottom so you've gotta round it to the nearest whole number<span />
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Using table 9.4, calculate an approximate enthalpy (in kj) for the reaction of 1.02 g gaseous methanol (ch3oh) in excess molecul
Tanya [424]

<u>Given:</u>

Mass of methanol = 1.02 g

<u>To determine:</u>

Enthalpy for the reaction of 1.02 g of methanol with excess O2

<u>Explanation:</u>

Balanced equation-

2CH3OH(g) + 3O2(g) → 2CO2(g) + 4H2O(g)

The reaction enthalpy is given as:

ΔHrxn = ∑nH°f(products) - ∑nH°f(reactants)

where n = number of moles

H°f = standard enthalpy of formation.

ΔHrxn = [2H°f(CO2(g)) + 4H°f(H2O(g))] - [2H°f(CH3OH(g)) + 3H°f(O2(g))]

           = [2(-393.5) + 4(-241.8)]-[2(-201.5) + 3(0)] = -1351.2 kJ

Now, 1 mole of CH3OH = 32 g

The calculated ΔHrxn corresponds to 2 moles of CH3OH. i.e.

The enthalpy change for 64 g of Ch3OH = -1351.2 kJ

Therefore, for 1.02g gaseous methanol we have:

ΔH = 1.02 * -1351.2/64 = -21.5 kJ

Ans: The enthalpy for the given reaction is -21.5 kJ



6 0
3 years ago
Which of the following is not an element that makes up all living organisms?
Bess [88]

Answer: Rubidium is correct

Explanation: The six most common elements in living things are carbon, hydrogen, oxygen, nitrogen, phosphorus, and sulfur. Atoms of these elements combine and form thousands of large molecules. These large molecules make up the structures of cells and carry out many processes essential to life.

8 0
3 years ago
1. Which population of organisms depends on eating another population of organisms for
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Answer:

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Explanation:

Predation An interaction in which one organism kills another for food. Prey An organism that is killed and eaten by another organism.

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3 years ago
Nitrogen (N) needs three more electrons to fill its outermost energy level. What is the number of electrons that Nitrogen (N) ha
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Answer: 5

Explanation: nitrogen has atomic number of 7 and its electronic configuration is 2, 5.

5 is the number of electrons in the outermost shell

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3 years ago
Which of the following elements has the most properties in common with iron (Fe)?
Fudgin [204]
If my memory serves me well, the following element which has the most properties in common with iron (Fe) is definitely <span>Osmium (Os) because they are stand for the same group! 
I'm sure it helps!</span>
8 0
3 years ago
Read 2 more answers
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