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coldgirl [10]
3 years ago
14

Two variables have a positive linear correlation. Does the dependent variable increase or decrease as the independent variable​

increases?
SAT
1 answer:
shepuryov [24]3 years ago
7 0

Answer:

increases

Explanation:

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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.

Learn more about empirical formula:

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3 0
2 years ago
How are you? How’s life?:)
Gemiola [76]
I’m doing so well and life is just life :) but what about u how has ur day been going
5 0
2 years ago
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Which statements about the system are true? select two options. Y = y equals startfraction 1 over 3 endfraction x minus 4. X – 4
Shtirlitz [24]

Answer:

x-43y-x=-7

or, x-x-43y=-7

or, 43y=-7

or, y =-7-43

or, y=50

8 0
2 years ago
Using the quadratic formula to solve 4x2 – 3x 9 = 2x 1, what are the values of x?.
jolli1 [7]

Answer:6

Explanation:

4902049w80ijof

5 0
2 years ago
Assume that the graphs in this figure represent the demand and supply curves for almonds. Which panel best describes what happen
lina2011 [118]

The  panel that best describes what happens in this market if there is an increase in the productivity of almond harvesters  is Panel (a).

<h3>What  is demands?</h3>

Demand is known to be the rate or the quantity of consumers who are known to be readily available or willing and able to buy a given products at any prices in course of a given period of time.

Note that the Demand for any commodity is one that tells that the consumers' need to get the good, their willingness also to pay for it.

Therefore, The  panel that best describes what happens in this market if there is an increase in the productivity of almond harvesters  is Panel (a) because it is the one among the options that tells us about the increase in productivity.

Learn more about demands from

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7 0
1 year ago
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