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iVinArrow [24]
3 years ago
8

What existed before the universe

Chemistry
1 answer:
marusya05 [52]3 years ago
6 0
Technically speaking absolutely nothing but from a religious standpoint God did
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In what month is the sun farthest below or south of the celestial equator?
KIM [24]

Answer: December

Explanation:

The winter solstice is around December 21, marking the date on which the Sun is lowest in the sky at noon and rises and sets farthest south.

7 0
3 years ago
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An atom has 13 protons and 14 neutrons. What is its mass number?
Hitman42 [59]
Protons have a mass of 1
Neutrons have a mass of 1

So 13*1 + 14*1 = Mass number 27
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3 years ago
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. How many grams of water would require 4400 joules
Alja [10]

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The specific heat of water is 4.18 J/g C.

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q

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Δ

T

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5 0
2 years ago
For the reaction ? Fe+? H2o ⇀↽? Fe3o4+? H2 , a maximum of how many grams of fe3o4 could be formed from 354 g of fe and 839 g of
Evgesh-ka [11]

The given reaction is:

3Fe + 4H2O → Fe3O4 + 4H2

Given:

Mass of Fe = 354 g

Mass of H2O = 839 g

Calculation:

Step 1 : Find the limiting reagent

Molar mass of Fe = 56 g/mol

Molar mass of H2O = 18 g/mol

# moles of Fe = mass of Fe/molar mass Fe  = 354/56 = 6.321 moles

# moles of H2O = mass of h2O/molar mass of H2O = 839/18 = 46.611 moles

Since moles of Fe is less than H2O;  Fe is the limiting reagent.

Step 2: Calculate moles of Fe3O4 formed

As per reaction stoichiometry:

3 moles of Fe form 1 mole of Fe3O4

Therefore, 6.321 moles of Fe = 6.321 * 1/ 3 = 2.107 moles of Fe3O4

Step 4: calculate the mass of Fe3O4 formed

Molar mass of Fe3O4 = 232 g/mol

# moles = 2.107 moles

Mass of Fe3O4 = moles * molar mass

= 2.107 moles * 232 g/mol = 488.8 g (489 g approx)

 


7 0
3 years ago
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9. Which of the following is true?
wlad13 [49]
The answer should be C
6 0
3 years ago
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