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Alecsey [184]
3 years ago
15

WILL AWARD BRAINLIEST HELPPPP

Chemistry
2 answers:
Burka [1]3 years ago
8 0

Answer:

14.65 g/cm³

happy to help ya

Explanation:

Talja [164]3 years ago
6 0

Answer:

The answer is

<h2>14.65 g/cm³</h2>

Explanation:

The density of a substance can be found by using the formula

density =  \frac{mass}{volume} \\

From the question

mass of object = 14.5 g

volume = 0.99 cm³

The density of the object is

density =  \frac{14.5}{0.99}  \\  = 14.64646464...

We have the final answer as

<h3>14.65 g/cm³</h3>

Hope this helps you

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The complete combustion of propane (C3H8) in the presence of oxygen yields CO2 and H2O: C3H8 (g) + 5O2 (g) 3CO2 (g) + 4H2O (g) a
mixas84 [53]

Answer:

26.9 L is the volume of CO₂, we obtained

Explanation:

The reaction is: C₃H₈(g) + 5O₂(g)  →  3CO₂ (g) + 4H₂O (g)

Let's determine the reactants moles:

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O₂ density = O₂ mass / O₂ volume

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1.429 g/L . 45L = O₂ mass → 64.3 g

Moles of O₂ → 64.3 g . 1mol/32g = 2.009 moles

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Therefore, 2.009 moles of O₂ must produce (2.009 .3) /5 = 1.21 moles of CO₂. Let's find out the volume, by Ideal Gases Law (STP are 1 atm and 273K, the standard conditions)

1 atm . V = 1.21 moles . 0.082 . 273K

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3 0
3 years ago
PLEASE HELP Determine the number of neutrons for the given isotopes:
zepelin [54]
<span>Helium = 1
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If we take nitrogen-15 for example; The number 15 tells you that the isotope has a mass of 15. Now if you look on the periodic table, Nitrogen has a proton number of 7. Only protons and neutrons have a mass, electrons are considered to be negligable. Therefore the number of neutrons Nitrogen-15 contains is 15 - 7 = 8 </span>
3 0
3 years ago
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Answer:

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Answer:

See image attached and explanation

Explanation:

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