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3 years ago

Do equal volumes of the same gas at the same temperature and pressure contain equal numbers of molecules (number of moles)?

1 answer:

4 0

Answer:Therefore, there must be a direct relationship between these volumes of gases and the number of molecules they contain. Avogadro's law says that: Equal volumes of different gaseous substances, measured under the same pressure and temperature conditions, contain the same number of molecules.

Explanation:I hope it works for you.

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HOW MANY GRAMS ARE IN 43.12 KG? WHAT IS THE UNIT?

jarptica [38.1K]

Answer:

43120 g

Explanation:

1 kg = 1000 g

43.12 = 1000(43.12) g

1000(43.12) = 43120

The unit is g because we are converting to grams, and the abbreviation for grams is g.

∴ 43.12 kg = 43120 g

8 0

1 year ago

Read 2 more answers

Which of these statements about cells is correct?

yan [13]

Answer:

A) Adult cells are larger than those in a child.

Explanation:

Fully-grown adults are much larger in size than young children.

3 0

3 years ago

Read 2 more answers

A 0.24 m solution of a weak base a‑ is made. to a limited extent, the a‑ reacts with h2o to form some oh- and some of the corres

hichkok12 [17]

Solution: The Molarity of solution of weak base is 0.24 M and pK_{a} of weak acid formed by its reaction with water is 9.5.

Let's initially all the weak base reacts with water to form hydroxide ion and weak acid as follows:

A^{-}+H_{2}O\rightarrow OH^{-}+HA

thus, concentration of A^{-}, OH^{-} and HA will become 0, 0.24 and 0.24 respectively.

Reverse reaction will take place as follows:

OH^{-}+HA\rightarrow A^{-}+H_{2}O

The change in concentration takes place, let's the change be x thus, concentration of OH^{-}, HA and A^{-} will become 0.24-x, 0.24-x and x respectively.

For the reaction, expression for acid dissociation constant will be:

K_{a}=\frac{[A^{-}]}{[HA][OH^{-}]}

Putting the values of concentration,

K_{a}=\frac{[x]}{[0.24-x][0.24-x]}....... (1)

From the pK_{a} of weak acid, acid dissociation constant can be calculated as follows:

pK_{a}=-logK_{a}

thus,

K_{a}=10^{-pK_{a}}

=10^{-9.5}

=3.16\times 10^{-10}

Putting the value in equation (1),

3.16\times 10^{-10}=\frac{[x]}{[0.24-x][0.24-x]}

Here, the value of K_{a} is very small so x can be neglected from denominator, thus,

3.16\times 10^{-10}=\frac{[x]}{[0.24][0.24]}

On solving,

x=4.26\times 10^{-6}

Concentration of hydroxide ion will be:

[OH^{-}]=0.24-x=0.24-4.26\times 10^{-6}=0.2399

now, pOH will be:

pOH=-log[OH^{-}]

=-log(0.2399)

=0.62

Use the following equation to calculate pH,

pH+pOH=14

thus,

pH=14-pOH

=14-0.62

=13.38

Thus, pH of solution is 13.38

8 0

3 years ago

Two difference between rhombic and monoclinic sulphur

Roman55 [17]

Answer:

The key difference between rhombic and monoclinic sulphur is that the rhombic sulphur is the most stable allotropic form of sulphur that exists as rhombic octahedral crystals whereas the monoclinic sulphur exists as long, needle-shape prisms but, it is stable only at temperatures between 96◦C and 119◦C.

Explanation:

Thanks . I hope you got help

8 0

4 years ago

Carbon diselenide (CSe2) is a liquid at room temperature. The normal boiling point is 125°C, and the melting point is –45.5°C. C

Tema [17]

Answer:

Explanation: The strengths of the inter molecular forces varies as follows -

$CO_{2}< CS_{2} < CSe_{2}$

The normal boiling point of CSe2 is 125°C and that of CS2 is 116°C, which explains the trend that as we move down the group, the boiling point of e compound increases as the size increases.

This usually happens because larger and heavier atoms have a tendency to exhibit greater inter molecular strengths due to the increase in size . As the size increases, the valence shell electrons move far away from the nucleus, thus has a greater tendency to attract the temporary dipoles.

And larger the inter molecular forces, more tightly the electrons will be held to each other and thus more thermal energy would be required to break the bonds between them.

5 0

3 years ago