2 years ago

What main chemicals are in space?

Chemistry

2 answers:

PolarNik [594]2 years ago

5 0

Hi!

I believe there are 4 main chemicals in space uracil, cytosine, thymine, and pyrimidine :)

PIT_PIT [208]2 years ago

3 0

Helium, hydrogen, dark matter

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If you were in a completely dark room, the room would still be "shining" in this type of light:

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3 years ago

How many molecules of oxygen are produced when a sample of 38.9 g of water is decomposed by electricity?

statuscvo [17]

Answer:

A) $6.5\times 10^{23}\ \text{molecules}$

Explanation:

m = Mass of water = 38.9

M = Molar mass of water = 18 g/mol

$N_A$ = Avogadro's number = $6.022\times 10^{23}\ \text{mol}^{-1}$

The reaction of electrolysis would be

$2H_2O(l)\rightarrow 2H_2(g)+O_2(g)$

Number of moles of $H_2O$

$n=\dfrac{m}{M}\\\Rightarrow n=\dfrac{38.9}{18}\ \text{mol}$

From the reaction it can be seen that 2 moles of $H_2O$ gives 1 mole of $O_2$

So, number of moles of $O_2$ produced is

$\dfrac{38.9}{18}\times \dfrac{1}{2}=1.081\ \text{mol}$

Number of molecules

$1.081N_A=1.081\times 6.022\times 10^{23}\\ =6.5\times 10^{23}$

So, $6.5\times 10^{23}\ \text{molecules}$ of oxygen is produced.

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2 years ago

Write the following measurement out of scientific notation. 2.345 x 10^-4 cm.

maw [93]

.0002345 I believe this is correct

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3 years ago

Helga [31]

Metallic I’m pretty sure. :)

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3 years ago