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kicyunya [14]
3 years ago
7

How many days does it take the earth to revolve around the Sun? this is for science class plz help.​

Chemistry
1 answer:
FinnZ [79.3K]3 years ago
3 0

365 days That is your answer ok

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What expression approximates the volume of O2 consumed, measure at STP, when 55 g of Al reacts completely with excess O2?2 Al(s)
nikdorinn [45]

Answer : The volume of O_2 consumed are, 0.75\times 2\times 22.4 L.

Explanation :

The balanced chemical reaction will be:

4Al(s)+3O_2(g)\rightarrow 2Al_2O_3(s)

First we have to calculate the moles of Al.

\text{Moles of }Al=\frac{\text{Mass of }Al}{\text{Molar mass of }Al}

Molar mass of Al = 27 g/mole

\text{Moles of }Al=\frac{55g}{27g/mol}=2mole

Now we have to calculate the moles of O_2.

From the reaction we conclude that,

As, 4 mole of Al react with 3 moles of O_2

So, 2 mole of Al react with \frac{3}{4}\times 2=0.75\times 2 moles of O_2

Now we have to calculate the volume of O_2 consumed.

As we know that, 1 mole of substance occupies 22.4 liter volume of gas.

As, 1 mole of O_2 occupies 22.4 liter volume of O_2 gas

So, 0.75\times 2 mole of O_2 occupies 0.75\times 2\times 22.4 liter volume of O_2 gas

Therefore, the volume of O_2 consumed are, 0.75\times 2\times 22.4 L.

3 0
4 years ago
16) How many grams are in 1.2 x 1024 molecules of CO?<br> a. 28<br> b. 6.02<br> c. 56<br> d. 1.2
EastWind [94]

Answer:

c. 56

Explanation:

Convert molecules --> moles --> grams

1.2 x 1024 molecules CO * 1 mol/6.022 x 1023 molecules * 28.01 g/1 mol = 55.8153438

Rounded is 56

Let me know if you need further explanation!!

3 0
3 years ago
How many electrons are in O2-?
egoroff_w [7]

Answer:

There will be 16 electrons in O2-

5 0
3 years ago
Which has more energy, 500g of ice or 500g of steam
liraira [26]

Answer:

Steam because steam pushes out and ice stays dormant.

Explanation:

5 0
3 years ago
Which temperatures are equal? (Refer to the diagram of the thermometer in the lesson.)
ella [17]

Answer:

d

Explanation:

4 0
4 years ago
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