Transcript STOIC.ppt
STEP THREE: CONVERT OBJECTIVE TO UNITS. STEP ONE: CONVERT KNOWN TO MOLES. CONVRERT TO MASS RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP CONVERT TO MOLES MOLES = MASS/GFM RECOGNIZE GIVEN IS AN AQUIOUS SOLUTION (aq) STEP TWO: MOLE RATIO CONVERT TO GAS VOL CONVERT TO MOLES MOLES =VOL(L)/22.4L RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 RECOGNIZE GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) MASS = MOLES * GFM CONVERT TO MOLES MOLES = PARTICLES 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M CONVERT TO MOLES MOLES =VOLUME * M CALCULATE THE YEILD OF NH3 in grams IF 8 GRAMS OF H2 REACTS COMPLETLEY WITH EXCESS NITROGEN. N2 + 3H2 2NH3 STEP THREE: CONVERT OBJECTIVE TO UNITS. STEP ONE: CONVERT KNOWN TO MOLES. RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP RECOGNIZE GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) RECOGNIZE GIVEN IS AN AQUIOUS SOLUTION (aq) CONVRERT TO MASS CONVERT TO MOLES STEP TWO: MOLE RATIO MASS = MOLES * GFM MOLES = MASS/GFM CONVERT TO GAS VOL CONVERT TO MOLES MOLES =VOL(L)/22.4L CONVERT TO MOLES MOLES = PARTICLES 6.02 * 1023 CONVERT TO MOLES MOLES =VOLUME * M RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M CALCULATE THE YEILD OF NH3 in grams IF 8.0 GRAMS OF H2 REACTS COMPLETLEY WITH EXCESS NITROGEN. N2 + 3H2 2NH3 STEP 1 Identify known (the substance that can be converted to moles), choose the correct equation to convert to moles. In this problem 8.0 grams of H2 is a given mass. MOLES = MASS/GFM MOLES = 8.00g/ 2.0 g/mol MOLES = 4.0 mol STEP 2 RATIO known to objective, use reaction coefficients to compare H2 known) to NH3 (objective). H2 = 3 = NH3 2 4.0 mol X , X = 2.66 mol NH3 STEP 3 Convert Objective to required units. Convert ammonia from grams to moles. MOLES = MASS/GFM 2.66 = MASS/ 17.0 g/mol MASS = 45.22 g CALCULATE THE REQUIRED QUANTITY OF H2 GAS AT STP TO PRODUCE 40 GRAMS OF NH3? N2 + 3H2 2NH3 STEP THREE: CONVERT OBJECTIVE TO UNITS. STEP ONE: CONVERT KNOWN TO MOLES. RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP RECOGNIZE GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) RECOGNIZE GIVEN IS AN AQUIOUS SOLUTION (aq) CONVRERT TO MASS CONVERT TO MOLES STEP TWO: MOLE RATIO MASS = MOLES * GFM MOLES = MASS/GFM CONVERT TO GAS VOL CONVERT TO MOLES MOLES =VOL(L)/22.4L CONVERT TO MOLES MOLES = PARTICLES 6.02 * 1023 CONVERT TO MOLES MOLES =VOLUME * M RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M