Stoechiométrie - 2 | Calculs chimiques
Chimie générale 2 - Stoechiométrie - 2
Combien de grammes de NaCl (solide) peuvent être produits à partir de 5,00 grammes de Na (solide) avec un excès de Cl2 (gaz) ?
Quelle est la masse minimale de Cl2 (gaz) requise ?
Equation: 2 Na (s) + Cl2 (g) → 2 NaCl (s)
2 moles of Na form 2 moles of NaCl ⇒ n consumed Na = n produced NaCl
n consumed Na = ⇒ n consumed Na = = 2.17 x 10-1 mol ⇒ n produced NaCl = 2.17 x 10-1 mol n produced NaCl = nNaCl = ⇒ mNaCl = n produced NaCl x MNaCl ⇒ mNaCl = 12.7 g
1 mole of Cl2 is necessary to form 2 moles of NaCl ⇒ nrequired Cl2 = nrequired Cl2 = 1.09 x 10-1 mol nrequired Cl2 = ⇒ mCl2 = n required Cl2 x MCl2 ⇒ mCl2 = 7.71 g
n consumed Na = ⇒ n consumed Na = = 2.17 x 10-1 mol ⇒ n produced NaCl = 2.17 x 10-1 mol n produced NaCl = nNaCl = ⇒ mNaCl = n produced NaCl x MNaCl ⇒ mNaCl = 12.7 g
1 mole of Cl2 is necessary to form 2 moles of NaCl ⇒ nrequired Cl2 = nrequired Cl2 = 1.09 x 10-1 mol nrequired Cl2 = ⇒ mCl2 = n required Cl2 x MCl2 ⇒ mCl2 = 7.71 g