Given the thermochemical data,

$A+B2CH=650K\frac{J}{m}ol2C+D2EH=-240K\frac{J}{m}ol$

Determine the enthalpy change for the following reaction applying Hess's law:

$A+B+D2E$

A$.410k\frac{J}{m}ol$

B$.650k\frac{J}{m}ol$

C$.240k\frac{J}{m}ol$

D$.890k\frac{J}{m}ol$

Which of the following is waterinsoluble based on the solubility guidelines?

A$.N{a}_{2}S$

B$.Ba(C_2{H}_3{O}_2{)}_2$

C$.CaC{O}_3$

D$.CuB{r}_2$

Which of the following is watersoluble based on the solubility guidelines?

A$.A{g}_{2}Cr{O}_4$

B$.C{a}_3(P{O}_4{)}_2$

C$.BaS{O}_4$

D$.ZnC{l}_2$

Calculate the molar concentration of a solution prepared by dissolving $65\mathrm{.}5$gNaOH $($molar mass: $39\mathrm{.}997\frac{g}{m}ol)$ in water to yield $1\mathrm{.}55L$ of solution.

A$.0\mathrm{.}75M$

B$.1\mathrm{.}06M$

C$.1\mathrm{.}22M$

D$.1\mathrm{.}55M$