Question

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When mercury oxide HgO is heated, it decomposes into mercury Hg and oxygen O2.


1) if 28.4 g of HgO decomposes and produces 2.0 g of oxygen, how many grams of Hg are produced?

____________________g


Use the correct sigfigs (subtraction)


2) What is the percent by mass of Hg in HgO?

___________________%


Use correct sigfigs (division)

Answer 1

If 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

What is decomposition reaction?

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input.

There are three different kinds of breakdown reactions: thermal, photolytic, and electrolytic.

$Mass_{reactant$ = $Mass_{product}$

$Mass_{mercury oxide$ = $Mass_{mercury} + mass_{oxygen}$

28g =        $mass_{mercury}$ + 2g

   $mass_{mercury}$ = 26g

Thus, 28.4 g of HgO decomposes and produces 2.0 g of oxygen, then 26 grams of Hg is produced.

$percentage mass_{mercury} = \frac{mass_{mercury}}{mass_{mercury}oxide}$  X 100%

= 26g/28g

= 93%

thus  93% is the percent by mass of Hg present in HgO.

To learn more about Decomposition reaction, refer to the below link:

https://brainly.com/question/14112196

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