What is the mass of $$\mathrm{KClO}_{3(\mathrm{~s})}$$ required to liberate 22. $$4 \mathrm{~dm}^3$$ oxygen at STP during thermal decomposition?

$$\left(\right.$$ Molar Mass of $$\left.\mathrm{KClO}_{3(\mathrm{~s})}=122.5 \mathrm{~g} / \mathrm{mol}\right)$$

Equal masses of $$\mathrm{H}_{2(\mathrm{~g})}$$ and $$\mathrm{He}_{(\mathrm{g})}$$ are enclosed in a container at constant temperature. The ratio of partial pressure of $$\mathrm{H}_2$$ to $$\mathrm{He}$$ is

What volume of $$\mathrm{CO}_{2(\mathrm{~g})}$$ at STP is obtained by complete combustion of $$6 \mathrm{~g}$$ carbon?

A hot air balloon has volume of $$2000 \mathrm{~dm}^3$$ at $$99^{\circ} \mathrm{C}$$. What is the new volume if air in balloon cools to $$80^{\circ} \mathrm{C}$$ ?