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ICE Princess25 [194]

3 years ago

7

Fossils allow us to analyze how organisms have changed over time. In which type of fossil does the organism get pressured and he

ated and leaves behind an image of what that organism looked like as shown below,
Preserved remains

Carbon film

Mold and cast

Trace fossil

1 answer:

Whitepunk [10]3 years ago

7 0

Carbon film

Bc fossils allows us to analyze

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Lead's symbol on the periodic table, pb, derives from the same latin word that gives us "______".

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Methanol and ethanol are said to be miscible in one another. What does this tell you?

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The climate of a place also depends upon the amount of water in the air. How do the rising temperatures around Earth affect the

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B) There is more water in the air because the rate of evaporation increases

Explanation:

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4 years ago

1) What is the mass of 6.2 mol of K2CO3?

lorasvet [3.4K]

Answer:

$\boxed {\boxed {\sf 856.8648 \ grams \ of \ K_2CO_3}}$

Explanation:

To convert from moles to grams, we must find the molar mass.

1. Molar Mass

First, identify the elements in the compound. K₂CO₃ It has potassium, carbon, and oxygen. Find these elements and their masses on the Periodic Table.

K: 39.098 g/mol
C: 12.011 g/mol
O: 15.999 g/mol

Note the subscript of 2 after K and 3 after O. We must multiply oxygen's molar mass by 2, then oxygen's by 3, and add carbon.

2(39.098 g/mol) + 3(15.999 g/mol) + 12.011 g/mol= 138.204 g/mol

2. Convert Moles to Grams

Use the molar mass as a fraction.

$\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}$

Multiply by the given number of moles: 6.2

$6.2 \ mol \ K_2CO_3 *\frac {138.204 \ g \ K_2CO_3}{1 \ mol \ K_23CO_3}$

$6.2 *\frac {138.204 \ g \ K_2CO_3}{1 }$

$6.2 * {138.204 \ g \ K_2CO_3}$

$856.8648 \ g \ K_2CO_3$

There are <u>856.8648 grams</u> of potassium carbonate in 6.2 moles.

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3 years ago