Calculate the concentration of dissolved gas in water at $25^{\circ} \mathrm{C}$ if partial pressure of gas at same temperature is 0.15 atm .

$$ \left[\mathrm{K}_{\mathrm{H}}=0.15 \mathrm{~mol} \mathrm{dm}^{-3} \mathrm{~atm}^{-1}\right] $$

Which from following is an essential amino acid?

What is the mass in grams of 0.25 mol water?

Which from following statements is correct regarding a detergent sodium lauryl sulphate?