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3 years ago

How can helium exist in three different forms

Chemistry

1 answer:

saul85 [17]3 years ago

6 0

Explanation:

Helium exists in three different forms due to the phenomenon of isotopy. Isotopy is the existence of two or more atoms of the same element having the same atomic number but different mass numbers due to the differences in the number of neutrons in their nuclei.

The atoms of these elements are called isotopes.
This is why Helium can exist in three different forms.
Isotopes have the same electronic configuration but with the same chemical properties.

Learn more:

isotopes brainly.com/question/1915462

Isotopy brainly.com/question/2593342

#learnwithBrainly

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A 211 g sample of barium carbonate, baco3, reacts with a solution of nitric acid to give barium nitrate, carbon dioxide, and wat

bija089 [108]

Answer:
Mass = 47.04 g

Volume = 23.94 L

Solution:

The equation for given reaction is as follow,

BaCO₃ + 2 HNO₃ → Ba(NO₃)₂ + CO₂ + H₂O

According to this equation,

197.34 g (1 mole) BaCO₃ produces = 44 g (1 mole) of CO₂
So,
211 g of BaCO₃ will produce = X g of CO₂

Solving for X,
X = (211 g × 44 g) ÷ 197.34 g

X = 47.04 g of CO₂

As we know,

44 g (1 mole) CO₂ at STP occupies = 22.4 L volume
So,
47.04 g of CO₂ will occupy = X L of Volume

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X = (47.04 g × 22.4 L) ÷ 44 g

X = 23.94 L Volume

8 0

3 years ago

What is the density of the black hole

Karolina [17]

the density of a black hole is 22.61 g/cm3 i think

7 0

3 years ago

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Consider the balanced equation below

Svet_ta [14]

PCl₃ + Cl₂ = PCl₅

1:1

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3 years ago

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Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction: 2NO2 → 2NO + O2 In a particular experiment at 300 °C, [

Setler [38]

Answer:

$rate=-1.75x10^{-5}\frac{M}{s}$

Explanation:

Hello,

In this case, for the given information, we can compute the rate of disappearance of NO₂ by using the following rate relationship:

$rate=\frac{1}{2}*\frac{C_f-C_0}{t_f-t_0}$

Whereas it is multiplied by the the inverse of the stoichiometric coefficient of NO₂ in the reaction that is 2. Moreover, the subscript <em>f</em> is referred to the final condition and the subscript <em>0</em> to the initial condition, thus, we obtain:

$rate=\frac{1}{2}*\frac{0.00650M-0.0100M}{100s-0s}\\\\rate=-1.75x10^{-5}\frac{M}{s}$

Clearly, it turns out negative since the concentration is diminishing due to its consumption.

Regards.

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3 years ago

Suppose you have a dozen carbon atoms, a dozen gold atoms, and a dozen iron atoms. Even though you have the same number of each,

mixer [17]

Answer:

By weight they have the same mass, but the number of atoms is different

Explanation:

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3 years ago

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