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Mercury(II) oxide (HgO) decomposes to form mercury (Hg) and oxygen (O2). The balanced chemical equation is shown below. 2HgO Right arrow. 2Hg O2 The molar mass of O2 is 32. 00 g/mol. How many moles of HgO are needed to produce 250. 0 g of O2? 3. 906 moles 7. 813 moles 15. 63 moles 73. 87 moles.

Sagot :

15.63 moles of HgO are needed to produce 250. 0 grams of Oxygen.

How we calculate moles from masses?

Moles of any substance can be calculated as:

n =W/M, where

W = given mass

M = molar mass

Given chemical reaction is:

2HgO → 2Hg + O₂

From the stoichiometry of the reaction, it is clear that:

2 mole of HgO = produce 1 mole of Oâ‚‚

Given mass of Oâ‚‚ = 250 grams

Molar mass of Oâ‚‚ = 32 g/mole

Mole of produced Oâ‚‚ = 250g / 32g/mole = 7.81 moles

Now, 7.81 moles of O₂ = produced by 2×7.81 = 15.63 moles of HgO

Hence, option (3) is correct i.e. 15.63 moles is the required moles.

To know more about moles, visit the below link:

https://brainly.com/question/16060223

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