Question

Help with homework explain GRADE12 1-3 please

Answer 1

1. a) 1.27 mol H₂SO₄

2. b) 19 g KCl

Step-by-step explanation:

The grass method is an acronym for Given, Required, Application, Solution, Statement.

1. a) Given, 125g H₂SO₄; Required, find the moles H₂SO₄; Application, 125g x molar mass of H₂SO₄, Solution,
`125g H2SO4 * (1molH2SO4)/(98.08gH2SO4) = 1.274469molH2SO4` Statement, Round to the lowest number of significant figures to get 1.27 mol H₂SO₄;

2. b) I am only show the equation for this one, but it is basically the same as the previous one. The molar mass of KCl is 74.55 g/mol.

`0.25molKCl*(74.55gKCl)/(1molKCl) = 18.6375 gKCl`

Round to the lowest number of significant figures which is two to get 19 g KCl.

For 3 the unit converter between moles and molecules is 6.022 x 10²³ molecules/mol.

Let me know if you need more help.