Chemistry Past Questions and Answers

A reaction takes places spontaneously if?

The standard enthalpies of formation of CO<sub style='font-size: smaller;'>2(g),</sub> H<sub style='font-size: smaller;'>2</sub>O(g) and CO<sub style='font-size: smaller;'>(g)</sub> in kJ mol<sup style='font-size: smaller;'>-</sup> are -394, -242 and -110 respectively. What is the standard enthalpy change for the reaction CO<sub style='font-size: smaller;'>(g)</sub> + H<sub style='font-size: smaller;'>2(g)</sub>O → CO<sub style='font-size: smaller;'>2(g)</sub> + H<sub style='font-size: smaller;'>2(g)</sub>?

10g of a solid is in equilibrium with its own vapour.<br/>When 1 g of a small amount of solid is added, the vapour pressure?

NaCI<sub style='font-size: smaller;'>(s)</sub> + H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4(I)</sub> → HCI<sub style='font-size: smaller;'>(g)</sub> + NaHSO<sub style='font-size: smaller;'>4(s)</sub>.<br/>In the reaction above, H<sub style='font-size: smaller;'>2</sub>SO<sub style='font-size: smaller;'>4</sub> behaves as?

Which of these gases can be dried with concentrated H2SO4?