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kenny6666 [7]
3 years ago
9

Endothermic/exothermic

Chemistry
1 answer:
ycow [4]3 years ago
4 0
Endothermic is when the compound absorbs energy in the reaction. Exothermic is the opposite: the compound releases energy in the reaction.
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What is acid precipitation?
zimovet [89]

Explanation:

precipitation like snow rain with increased acid is know as acid precipitation

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3 years ago
How is it possible for scientists to know the composition of stars without traveling to the star?
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One of the most common methods used today to determine the composition of stars is <u>spectroscopy</u>.

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Spectroscopy is the study of the interaction between matter and electromagnetic radiation as a function of the wavelength or frequency of the radiation.

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3 years ago
What is the pH of 1.0M HI solution?
ozzi

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0

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Genetic engineeering has been utilized for the production of
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3 years ago
basketane is a hydrocarbon that is 90.8% carbon. If the molar mass is between 130-140 g/mol find the molecular formula of the co
alisha [4.7K]

Answer:

C₁₀H₁₂

Explanation:

90.8% of basketane (Hydrocarbon, contains only C and H) is Carbon, and 100-90.8 = 9.2% of the mass is hydrogen.

The molar mass is between 130-140g/mol, That means the moles of Carbon (Using its molar mass, 12.01g/mol) that are in basketane are between:

140g/mol /12.01g/mol *90.8%= 10.58 moles of C.

130g/mol / 12.01g/mol *90.8%= 9.83 moles of C.

As the moles of carbon must be given in a whole number, There are 10 moles of Carbon.

10 moles C * (12.01g / mol) = 120.1g/mol that are 90.8% of the molar mass. Molar mass of basketane is:

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132.3g/mol.

The part of the molar mass due hydrogen must be:

132.3 g/mol - 120.1g/mol = 12.2 g/mol

As molar mass of hydrogen is 1g/mol, the moles of hydrogen are 12

And molecular formula is:

<h3>C₁₀H₁₂</h3>

6 0
3 years ago
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