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Vesnalui [34]
3 years ago
11

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

Chemistry
1 answer:
Dominik [7]3 years ago
7 0

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

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Sum of brother and sisters age is 26. Four times the brothers age is subtracted from three times the sisters age, the difference
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Answer : The ages of the brother and sister are, 10 and 16 years respectively.

Solution :

Let the age of brother be 'x' and the age of sister be 'y'

There are two equations formed which are,

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First we have to multiple equation (1) by 4 and then added equation (1) and (2), we get the value of 'y'.

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Now put the value of 'y' in equation (2), we get the value of 'x'

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