# Question #bfd77

##### 2 Answers

#### Answer:

#### Explanation:

Let the original mixture has no. of grams of Sodium carbonate

The given reaction is

From Mole concept we see that

Average Molar mass of

Average Molar mass of

Total sodium carbonate in the final mixture

Solving for

As the original mixtuer is

Percentage of sodium carbonate

#### Answer:

74.8%

#### Explanation:

On heating the given mixture of 100g of

**The Equation**

According to this balanced equation 2 moles of solid

Molar mass of

Molar mass of

Molar mass of

By the problem the decrease in mass = initial mass -residual mass= 100-90.7=9.3g

According to the decomposition reaction total 44+18=62g decrease in mass occurs for presence of

So decrease in mass of 9.3 g will occur for the presence of

in the given mixture

So the amount

So percentage of