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Umnica [9.8K]
3 years ago
8

Which statement about the alkali metals is correct?

Chemistry
1 answer:
icang [17]3 years ago
5 0

Answer:

Sofia the firstttdbshsgshaksus

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How many moles are in 153.00 grams of KCL3?
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Explanation:

you have to use the formula

number of moles=mass/molar mass

=153/145.5

=1.05g/mol

I hope this helps

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Pop goes flat when it loses carbon dioxide. How can you prevent this?
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How many hydrogen atoms are contained in 167 grams of propane?
Dmitry_Shevchenko [17]

Propane is C3H8

So Molar mass propane = 3*12 + 8*1 = 44 <span>
No. of moles of propane = 167/44 = 3.795 moles</span>

From the stoichiometry: <span>
No. of moles of hydrogen = 3.795 moles * (8 moles hydrogen / 1 mole propane) = 30.36 moles 

Using Avogadros number, 1 mole of any substance contains 6.022 x 10^23 atoms, therefore: 
<span>No. of hydrogen atoms = 30.36 * 6.022 x 10^23 = 1.828 x 10^25 atoms</span></span>
4 0
3 years ago
How many times bigger is the solar system than the earth ?
marishachu [46]

Answer: about 36 billion times larger than Earth

Explanation:

4 0
4 years ago
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What method would you use to obtain pure water from a mixture of water and ink
mel-nik [20]

Answer: Distillation

Explanation: Separate ink from water using a process called distillation. This is a process of separating two substances mixed together. Water vaporizes at a lower temperature than the ink pigment so if you heat them, the water evaporates, leaving the ink pigment in the flask.

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