NaHCO3 Na2CO3 CO2 20.5 g

NaHCO3 Na2CO3 CO2 20.5 g

 

 

When baking soda (sodium bicarbonate or

sodium hydrogen carbonate, NaHCO3) is heated,

it releases carbon dioxide gas,

which is responsible for the rising of cookies, donuts, and bread.

(a) Write a balanced equation for the decomposition of the compound

(one of the products is Na2CO3).

(b) Calculate the mass of NaHCO3 required to produce 20.5 g of CO2.

 

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균형 맞춘 반응식

2NaHCO3 → Na2CO3 + CO2 + H2O

( 참고 https://ywpop.tistory.com/13474 )

 

 

 

> NaHCO3의 몰질량 = 84.01 g/mol

> CO2의 몰질량 = 44.01 g/mol

 

 

 

CO2 20.5 g 생성에 필요한 NaHCO3의 질량(g)을

질량비로 계산하면,

( 참고: 질량비로 계산 https://ywpop.tistory.com/5078 )

 

2NaHCO3 : CO2 = 2(84.01) : 44.01 = ? g : 20.5 g

 

? = 2(84.01) × 20.5 / 44.01 = 78.264 g NaHCO3

 

 

 

답: 78.3 g

 

 

 

 

[키워드] NaHCO3 열분해 기준문서, 베이킹 소다 기준문서