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masha68 [24]
2 years ago
9

The chemical equation below shows the burning of magnesium (Mg) with oxygen (O2) to form magnesium oxide (MgO).

Chemistry
2 answers:
Leto [7]2 years ago
7 0
For every 2 mole Mg we need 1 mole O2 ( based on the equation). since there is 4 mole Mg we need 2 mole O2. one mole O2 is 32 gram so 2 mole would be 64 grams.
dimulka [17.4K]2 years ago
4 0

Answer: 64 grams of O_2 will be required to react completely with 4 moles of Mg.

Explanation: The chemical equation of burning of magnesium is given by:

2Mg(s)+O_2(g)\rightarrow 2MgO(s)

By stoichiometry,

2 moles of Magnesium require 1 mole of oxygen to produce 2 moles of MgO.

\text{4 moles of Magnesium will require}=\frac{1}{2}\times 4=2\text{ moles of }O_2

Amount of O_2 required to form MgO can be calculated by:

\text{Mass of }O_2 \text{ required}=Moles\times \text{Molecular mass of }O_2

Molecular mass of O_2=32g/mol

\text{Mass of }O_2\text{ required}=2moles \times 32g/mol

                               = 64 grams

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Answer:

The barrier has to be 34.23 kJ/mol lower when the sucrose is in the active site of the enzyme

Explanation:

From the given information:

The activation barrier for the hydrolysis of sucrose into glucose and fructose is 108 kJ/mol.

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