5. At what pressure will 7.89 g of ammonia gas, \( \mathrm{NH}_{3} \), occupy 7.46 L at \( 20.0^{\circ} \mathrm{C} \) ?

Which is the correct Lewis structure for acetylene (\(C_ { 2} H_ { 2} \))?

3. จงอ่านชื่อของสารประกอบต่อไปนี้ 3.1 Bas

3. จงอ่านชื่อของสารประกอบต่อไปนั้ 3.1 Bas \( 3.2 \mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2} \) 3.3 ZnO \( 3.4\left(\mathrm{NH}_{4}\right) \mathrm{HPO}_{4} \) \( 3.5 \mathrm{~K}_{2}\left(\mathrm{CO}_{4}\right. \)

You can also do the reverse, calculate the \( \mathrm{H}_{3} \mathrm{O}^{+} \)molarity from the pH , using the formula \( \mathrm{H}_{3} \mathrm{O}^{+} \)molarity \( =10^{-}-\mathrm{pH} \) What is the \( \mathrm{H}_{3} \mathrm{O}^{+} \)molarity of a solution having the pH of 2.56 ?

A substance with a pH of 2 is