Question

Calculate the percentage by mass of lithium in lithium hydroxide.

Answer 1

To calculate the percentage by mass of lithium in lithium hydroxide, divide the mass of lithium by the molar mass of lithium hydroxide and multiply by 100%.

Step-by-step explanation:

To calculate the percentage by mass of lithium in lithium hydroxide, we need to know the molar mass of lithium hydroxide and the mass of lithium in 1 mole of lithium hydroxide. The molar mass of lithium hydroxide (LiOH) is 23.95 g/mol (6.94 g/mol for lithium + 16.00 g/mol for oxygen + 1.01 g/mol for hydrogen).

Since there is 1 lithium atom in 1 mole of lithium hydroxide, the mass of lithium in 1 mole of lithium hydroxide is 6.94 g.

To calculate the percentage by mass of lithium, we divide the mass of lithium by the molar mass of lithium hydroxide and multiply by 100%:

Percentage by mass of lithium = (mass of lithium / molar mass of lithium hydroxide) x 100%

Percentage by mass of lithium = (6.94 g / 23.95 g/mol) x 100%

Percentage by mass of lithium = 28.94%

Answer 2

20.1

Step-by-step explanation:

li/LiOH×100/1

6/6+16+1×100/1

6/23=20.1%