Final answer:
The mass percent of NaOH in a mixture with NaCl is calculated by dividing the mass of NaOH by the total mass of the mixture and multiplying by 100. With 13.91g of NaOH and 58.41g of NaCl, the mass percent of NaOH is 19.24%.
Step-by-step explanation:
To calculate the mass percent of NaOH in a mixture, you need to divide the mass of NaOH by the total mass of the mixture and then multiply by 100 to get the percentage. To find the mass percent of NaOH when mixed with NaCl, use the given masses of each compound: 13.91g of NaOH and 58.41g of NaCl.
The total mass of the mixture is the sum of the mass of NaOH and NaCl, which is 13.91g + 58.41g = 72.32g. The mass percent of NaOH is therefore calculated as:
(Mass of NaOH / Total mass of mixture) × 100 = (13.91g / 72.32g) × 100
Carry out the calculation:
(13.91g / 72.32g) × 100 = 19.24%
The mass percent of NaOH in the mixture is 19.24%.