1. Lithium hydrogen carbonate decomposes by heat; the reaction is represented by

Question

1. Lithium hydrogen carbonate decomposes by heat; the reaction is represented by the balanced equation:

2LiHCO3 (s) --------> Li2CO3(s) + CO2(g) + H20 (g)

a.) If 0.24 mol of LiHCO3 is decomposed completely, how many mol of Li2CO3 will be formed?

b.) If 136 g of LiHCO3 are decomposed completely, how many g of Li2CO3 will be formed?

c.) What is the combined weight of the CO2 and H20 in b?

2. a.) A sample of LiHCO3 and sand mixture weighing 9.62 g is decomposed by heat. After cooling, the residue, which is composed of Li2CO3 and sand, is formed to weigh 6.85 g. Assuming that the sand in the sample is unaffected, calculate the weight loss due to the evolution of gaseous CO2 and H2O.

b.) Calculate the weight of LiHC03 in the original mixture.

Explanation / Answer

)from the equation you can see that 2 moles of LiHCO3 give 1 mole of Li2CO3 so the ratio is 2:1 therefore 0,12mol of Li2CO3 will be formed from 0,24 mol LiHCO3
first see how many moles 136g of LiHCO3 corresponds then then divide it by 2 to see how many moles of Li2CO3 will be formed and find its molecular mass from that
simply mulitply the molecular of CO2 and H2 by the amount of moles formed as seen in the equation they are also a 2:1 ratio with LiHCO3

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.