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aniked [119]
3 years ago
14

How many grams of mgo are produced when 40.0 grams of o2 react completely with mg? 2 mg (s) + o2 (g) → 2 mgo (s)?

Chemistry
1 answer:
SSSSS [86.1K]3 years ago
8 0

Answer: -

100 grams

Explanation: -

Mass of Oxygen = 40 g

Chemical formula of oxygen gas = O2

Molar mass of oxygen = 16 x 2 = 32 gram

Atomic mass of Mg = 24g

Molar mass of MgO = 24 x 1 + 16 x 1 =40 gram

The balanced chemical equation for the reaction is

2Mg + O2 -- > 2 MgO

So from the balanced equation we see that 1 O2 react to give 2 MgO

32 grams of O2 react to give 2 x 40 gram of MgO

40 grams of O2 react to give \frac{2 x 40 gram x 40 gram}{32 gram}

=100 gram of MgO

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Answer:

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Explanation:

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>>>>To calculate the Molarity of MgSO₄ we find the number of moles using the mass of MgSO₄ given.

Number of moles = mass/ molar mass

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Atomic masses: Mg = 24g

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Molar mass of MgSO₄ = [24 + 32 + (16x4)]g/mol

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Number of moles = 122/120 = 1.02mol

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Molarity = number of moles/ Volume

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