Answer:
1. start line drawn in ink
2. start line below solvent level
Explanation:
1. the line would run up the paper. should have drawn with pencil.
2. the samples would dissolve into solvent and not run up the paper.
Answer:
66.7 g
Explanation:
Number of atoms = 2×10²¹
Mass of 2×10²¹ atoms = 0.4 g
Mass of 0.5 moles of that element = ?
Solution:
1 mole contain 6.022×10²³ atoms
2×10²¹ atoms × 1 mol / 6.022×10²³ atoms
0.33×10⁻² mol
0.003 mol
0.003 mole have mass of 0.4 g
0.5 mol have mass 0.5/0.003×0.4 g = 66.7 g
Bro honestly I don’t understand either
I think it enters a new material
