(Solved): A 0.685g sample of NaHCO3 is decomposed by heating to form Na2CO3. When the sample is co ...

A $0.685\mathrm{g}$ sample of ${\mathrm{NaHCO}}_3$ is decomposed by heating to form ${\mathrm{Na}}_2{\mathrm{CO}}_3$. When the sample is cooled it weighs $0.418\mathrm{g}$. Calculate the theoretical yield of ${\mathrm{Na}}_2{\mathrm{CO}}_3$. Calculate the percent yield of ${\mathrm{Na}}_2{\mathrm{CO}}_3$. $2{\mathrm{NaHCO}}_3(s)\stackrel{?}{?}{\mathrm{Na}}_2{\mathrm{CO}}_3(s)+{\mathrm{H}}_2{\mathrm{CO}}_3(g)$ A $4.076\mathrm{g}$ sample of powder contains ${\mathrm{LiHCO}}_3$ and an unknown amount of unreactive salt. When it is decomposed it weighed $2.580\mathrm{g}$. Calculate the $\%{\mathrm{LiHCO}}_3$ in the unknown powder. $2{\mathrm{LiHCO}}_3(s)\stackrel{?}{?}{\mathrm{Li}}_2{\mathrm{CO}}_3(s)+{\mathrm{H}}_2{\mathrm{CO}}_3(\mathrm{g})$