1. Déterminer la masse molaire des molécules suivantes :a. le propane C3H8b. la saccharose C12H22O11c. l’aspirine C9H8O4d. sulfate de cuivre pentahydraté CuSO4 ; 5H2Oe. l’ion nitrate NO3-f. l’ion ammonium NH4+2. Quelle quantité de matière y a-t-il dans V =50 mL d’alcool C2H6O de massevolumiqueρ =0,78 g . cm−3 ?
Question
- Déterminer la masse molaire des molécules suivantes :a. le propane C3H8b. la saccharose C12H22O11c. l’aspirine C9H8O4d. sulfate de cuivre pentahydraté CuSO4 ; 5H2Oe. l’ion nitrate NO3-f. l’ion ammonium NH4+2. Quelle quantité de matière y a-t-il dans V =50 mL d’alcool C2H6O de massevolumiqueρ =0,78 g . cm−3 ?
Solution
- Pour déterminer la masse molaire des molécules, nous devons additionner les masses molaires de chaque atome qui compose la molécule. Les masses molaires atomiques sont généralement trouvées sur le tableau périodique des éléments.
a. Propane, C3H8 : (3 * 12.01 g/mol C) + (8 * 1.008 g/mol H) = 44.11 g/mol b. Saccharose, C12H22O11 : (12 * 12.01 g/mol C) + (22 * 1.008 g/mol H) + (11 * 16.00 g/mol O) = 342.30 g/mol c. Aspirine, C9H8O4 : (9 * 12.01 g/mol C) + (8 * 1.008 g/mol H) + (4 * 16.00 g/mol O) =
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