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puteri [66]
3 years ago
9

By what the two poles of the earthare covered?​

Chemistry
1 answer:
Liula [17]3 years ago
4 0

Answer:

The Two poles are covered with thick ice and sorrounded by Arctic Ocean which is frozen.

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Which of the following compounds represents a covalent bond?
Assoli18 [71]
Bis the correct answer
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3 years ago
Which gas will effuse at the rate closest At a particular pressure and temperature, nitrogen gas effuses at the rate of 79mLs. U
Contact [7]

Answer : The rate of effusion of sulfur dioxide gas is 52 mL/s.

Solution :

According to the Graham's law, the rate of effusion of gas is inversely proportional to the square root of the molar mass of gas.

R\propto \sqrt{\frac{1}{M}}

or,

(\frac{R_1}{R_2})=\sqrt{\frac{M_2}{M_1}}       ..........(1)

where,

R_1 = rate of effusion of nitrogen gas = 79mL/s

R_2 = rate of effusion of sulfur dioxide gas = ?

M_1 = molar mass of nitrogen gas  = 28 g/mole

M_2 = molar mass of sulfur dioxide gas = 64 g/mole

Now put all the given values in the above formula 1, we get:

(\frac{79mL/s}{R_2})=\sqrt{\frac{64g/mole}{28g/mole}}

R_2=52mL/s

Therefore, the rate of effusion of sulfur dioxide gas is 52 mL/s.

4 0
3 years ago
How many moles are there in<br> 15 grams of:<br> CaCO3<br> 204 grams of:<br> Al203
DerKrebs [107]

1) moles = mass/mR

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= 100

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so the moles would be 15 ÷ 100

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2) moles = mass ÷ Mr

Mr of Al2O3 = 27 + (16×3)

= 27 + 48

= 75

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so the moles would be 204/75 which is 2.72 moles of Al2O3

3 0
3 years ago
An element has two naturally-occurring isotopes. The mass numbers of these isotopes are 115.00 u and 117.00 u, with natural abun
denis23 [38]

(115.00)(0.25)+(117.00)(0.75)=\boxed{116.50 \text{ u}}

3 0
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There are some cells that do not have DNA. <br> O True<br> O false
raketka [301]

Answer:

false

Explanation:

8 0
3 years ago
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