How many moles of helium atoms are there in 2. 4 x 1024 helium atoms?.

What is the value of X?

nevsk [136]

Answer:

Explanation:

Because 25 is a perfect square of 5, we can turn

$5^{3x - 5}$ = $25^{x + 1}$

into

$5^{3x - 5}$ = $5^{2x + 2}$

Since the bases are now both equal, we can completely ignore them, as we are only trying to find x. This leaves us with:

3x - 5 = 2x + 2

All we have to do now is solve for x:

x - 5 = 2 <em>Subtract 2x from both sides.</em>

<u>x = 7</u> <em>Add 5 to both sides.</em>

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<em>Hope this helps! :)</em>

6 0

2 years ago

Read 2 more answers

Determine the empirical formula of a compound containing 47. 37 grams of carbon, 10. 59 grams of hydrogen, and 42. 04 grams of o

Effectus [21]

Considering the definition of empirical formula, the empirical formula is C₃H₈O₂ and the molecular formula is C₉H₂₄O₆.

<h3>Definition of empirical formula</h3>

The empirical formula is the simplest expression to represent a chemical compound, which indicates the elements that are present and the minimum proportion in whole numbers that exist between its atoms, that is, the subscripts of chemical formulas are reduced to the most integers. small as possible.

<h3>Empirical formula in this case</h3>

In this case, you have:

Carbon (C): 47.37 grams
Hydrogen (H): 10.59 grams
Oxygen (O): 42.04 grams

Then it is possible to calculate the number of moles of each atom in the molecule, taking into account the corresponding molar mass:

Carbon (C): $\frac{47.37 grams}{12 \frac{g}{mole} }$ = 3.95 moles
Hydrogen (H): $\frac{10.59 grams}{1 \frac{g}{mole} }$ = 10.59 moles
Oxygen (O): $\frac{42.04 grams}{16 \frac{g}{mole} }$ = 2.63 moles

The empirical formula must be expressed using whole number relationships, for this the numbers of moles are divided by the smallest result of those obtained. In this case:

Carbon (C): $\frac{3.95 moles}{2.63 moles }$ = 1.5
Hydrogen (H): $\frac{10.59 moles}{2.63 moles }$ = 4
Oxygen (O): $\frac{2.63 moles}{2.63 moles }$ = 1

Finally, since in the empirical formula the numbers of moles must be expressed in whole numbers, the ratio of atoms is multiplied by some number with which everything is obtained in simple whole numbers (in this case by 2):

Carbon (C): 1.5× 2= 3
Hydrogen (H): 4× 2= 8
Oxygen (O): 1× 2= 2

Therefore the C: H: O mole ratio is 3: 8: 2

Finally, the empirical formula is C₃H₈O₂.

<h3>Molecular formula</h3>

To obtain the molecular formula you must relate its molecular weight (PMc) with the molecular weight of the empirical formula (PMfe).

PMfe= PM (C₃H₈O₂)= 76 g/mole

The molar mass of the compound (PMc) was determined to be 228.276 g/mol. Dividing this mass PMc by the molar mass of the empirical formula PMfe gives:

228.276 g/mol ÷ 76 g/mole= 3

This means that in the molecular formula there are 3 unit formulas (empirical formulas), so it is necessary to multiply the number of all atoms by 3.

Then, the molecular formula is C₉H₂₄O₆.

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This natural resource was once very abundant in Western Europe and helped power the Industrial Revolution. Question 4 options: I

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Answer: Its Coal

Explanation: I did the K12 quiz

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Because stalin feared western capitalist expansion, he

mote1985 [20]

Because Stalin feared Western capitalist expansion, he refused to allow free elections in Eastern Europe.

<h3>What is Capitalism?</h3>

This refers to the economic system where businesses are allowed to thrive in a free market system with the main aim of making a profit.

Hence, we can see that based on the difference in ideology between America and the Soviet Union; capitalism and communism, Joseph Stalin refused to allow free elections in Eastern Europe for a fear of capitalist expansion.

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if the passage is argument say it argument if the passage is non argument say it non argumnet 1, i belive that it must be the po

Sunny_sXe [5.5K]

I believe that it must be the policy of united states -argument.

I believe that we must assist free people- Not argument.

I believe that our help should be primarily through economic and financial aid - argument

<h3>How do you know if the passage is an argument or not?</h3>

A passage is known to be an argument if the Context is trying to convince you about an idea and if its conclusion has what it is trying to convince you of.

Note that one need to know the Reasons and why one need to believe them for it to be an argument.

Therefore, I believe that it must be the policy of united states -argument.

I believe that we must assist free people- Not argument.

I believe that our help should be primarily through economic and financial aid - argument

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1 year ago