A 11 Vérifier un ordre de réaction (2)
Exploiter un graphique.
À 25 °C, on étudie la
Concentration en As (III)
réaction de l'arsenic (III)
0,25 (mol. L-1)
avec le peroxyde d'hy- 0,20
drogène en large excès. .
0,15
On trace l'évolution
temporelle de la concen- 0,10
B
tration en arsenic (III) de
0,05
deux solutions A et B de
concentrations initiales 0
10 20 30 40 50
différentes en arsenic (III).
t(min)
1. Déterminer les
temps de demi-réaction.
2. Vérifier
que
la réaction est d'ordre 1 par rapport à
l'arsenic (III).

How many moles are in 250 grams of tungsten (w)? * 4.4x10^23 moles 4.2x10^23 moles 0.7 moles 1.4 moles

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

What relationship exists between an enzyme and a catalyst?