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3 years ago

Consider the following reaction:

1 answer:

4 0

Kc = [H2S]²*[O2]³ / [H2O]²*[SO2]²
Let x be the moles of H2S formed. Each mole of H2S takes one each mole of H2O and SO2 so after the reactions
[H2O] = 2.8 - x and [SO2] = 2.6 - x also for each mole of H2S, 1.5 moles of O2 are formed, so [O2] = 1.5*x
Kc = x²*(1.5*x)³ / (2.8 - x)²*(2.6 - x)²
Thus use 2.8 - x = 2.8 and 2.6 - x = 2.6 in the above equation for Kc:
Kc = x²*(1.5*x)³ / 2.8²*2.6² = 3.375x^5 / 2.8²*2.6² = 0.06368*x^5
x^5 = 1.3*10^-6 / 0.06368 = 2.0414*10^-5
x = 0.115M hope it helps

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4 years ago

How many moles are in 128.9 grams of Cr2(SO3)2?

Dominik [7]

Answer: 0.5 moles

Explanation:

Cr2(SO3)2 is the chemical formula for chromium sulphate.

Given that,

Amount of moles of Cr2(SO3)2 (n) = ?

Mass of Cr2(SO3)2 in grams = 128.9g

For molar mass of Cr2(SO3)2, use the atomic masses:

Chromium, Cr = 52g;

Sulphur, S = 32g;

Oxygen, O = 16g

Cr2(SO3)2 =

(52g x 2) + [(32g + 16g x 3) x 2]

= 104g + [(32g + 48g) x 2]

= 104g + [80g x 2]

= 104g + 160g

= 264g/mol

Since, n = mass in grams / molar mass

n = 128.9g / 264g/mol

n = 0.488 mole [Round the value of n to the nearest tenth which is 0.5

Thus, there are 0.5 moles in 128.9 grams of Cr2(SO3)2

7 0

3 years ago

The Quiver tree grows in Southern Africa. Which of the following plant adaptations is likely to prevent these trees from dying o

Gekata [30.6K]

Answer:

The correct option is Ability to store water in leafy structures to prevent excess evaporation.

Explanation:

Desert plants need to have adaptations so that they can withstand the harsh conditions of the environment. In order to withstand the harsh temperatures of the desert, a quiver tree has leafy structures which help it to store water for long time. In this way, water is prevented to be lost from the tree due to evaporation. Hence, it is an effective adaptation to live in desert conditions.

The Quiver tree also has white powder on is branches to hide from the Sun's rays.

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4 years ago

How should you remove a beaker from a hot plate after heating it?.

ohaa [14]

Answer:

One of the students should place a wire gauze on the lab station to set the beaker on. Using the beaker tongs, one of the students should gently remove the beaker from the hot plate and set it down on to the wire gauze.

Explanation:

I hope it will help you...

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2 years ago

The mass of an iron(II) sulfate crystal is 8.36 g.How many moles of FeSO4 are in the crystal?

Yuki888 [10]

The number of moles present in the FeSO4 are 0.055 mol.

Explanation:

The mass of a substance containing the same number atoms in 12.0 g of 12C is known as mole. One mole of any substance is equal to 6.023 x 10^23. The moles of a substance can be determined by using the formula,

Number of moles = mass in grams / molecular mass

Given,

mass = 8.36 g,

molecular mass of FeSO4 = 151.908 g / mol

number of moles = 8.36 / 151.908

= 0.055 mol.

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4 years ago