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Anna007 [38]
3 years ago
8

How is life on Earth affected by Earth's revolution around the Sun

Chemistry
1 answer:
kolezko [41]3 years ago
3 0
Some laces get warm and some get cold
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Fantom [35]

First one is B and the second one is C

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You have 0.21 moles of Al how many atoms do you have
ZanzabumX [31]

Number of atoms : 1.26 x 10²³

<h3>Further explanation  </h3>

The mole is the number of particles(molecules, atoms, ions) contained in a substance  

1 mol = 6.02.10²³ particles

Can be formulated

N=n x No

N = number of particles

n = mol

No = Avogadro's = 6.02.10²³

0.21 moles of Al, so n = 0.21

Number of atoms :

\tt N=0.21\times 6.02\times 10^{23}\\\\N=1.26\times 10^{23}

8 0
3 years ago
Which of the following can be true about a chemical reaction
MissTica
chemical reactions can release heat (a)
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How many molecules are in 1.5 mole of glucose
GalinKa [24]

Answer:

In one mole of glucose, there are

6.022×1023

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Explanation:

7 0
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How many moles of ammonia gas occupy 50 mL at at 700 kPa and 30.0 0C?
nalin [4]

For the conversions

I will start with pressure
1atm=101.3kPa
x =700kPa
x=700kPa/101.3kPa
x=6.91atm

Temperature
273K+30.00C
303K

Volume
1L=1000ml
x =50ml
x=0.05L

PV=nRT
6.91*0.05=n*0.08206*303
0.3455=24.86418n
0.3455/24.86418=n
0.0138=n
number of moles = 0.0138moles

Note: 0.08206 is the gas constant in this case
6 0
3 years ago
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