Question

1. how does cork act as a protective tissue ?
2. to make a saturated solution 30g of sodium chloride is dissolved in 100g of water at 293 k . find its concentration at the temperature .

Explanation:

Step1: Recall the formula for mass - percentage concentration

Mass - percentage concentration = $\frac{\text{Mass of solute}}{\text{Mass of solution}}\times100\%$

Step2: Calculate the mass of the solution

Mass of solution = Mass of solute+Mass of solvent. Here, mass of solute (sodium chloride) = 30g and mass of solvent (water) = 100g. So, mass of solution = 30g + 100g=130g

Step3: Calculate the concentration

Concentration = $\frac{30g}{130g}\times100\%=\frac{3000}{130}\% \approx 23.08\%$

Answer:

The concentration of the saturated solution of sodium chloride at 293 K is approximately 23.08%