STEP THREE: CONVERT OBJECTIVE TO UNITS.

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Presentation transcript:

STEP THREE: CONVERT OBJECTIVE TO UNITS. CONVERT TO GAS VOL VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) GIVEN IS AN AQUIOUS SOLUTION (aq) MOLES = MASS/GFM MOLES =VOL(L)/22.4L MOLES = PARTICLES 6.02 * 1023 RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION MOLES =VOLUME * M CONVRERT TO MASS MASS = MOLES * GFM STEP ONE: CONVERT KNOWN TO MOLES. STEP TWO: MOLE RATIO STEP THREE: CONVERT OBJECTIVE TO UNITS.

STEP THREE: CONVERT OBJECTIVE TO UNITS. CALCULATE THE YEILD OF NH3 in grams IF 8 GRAMS OF H2 REACTS COMPLETLEY WITH EXCESS NITROGEN. N2 + 3H2  2NH3 CONVERT TO GAS VOL VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) GIVEN IS AN AQUIOUS SOLUTION (aq) MOLES = MASS/GFM MOLES =VOL(L)/22.4L MOLES = PARTICLES 6.02 * 1023 RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION MOLES =VOLUME * M CONVRERT TO MASS MASS = MOLES * GFM STEP ONE: CONVERT KNOWN TO MOLES. STEP TWO: MOLE RATIO STEP THREE: CONVERT OBJECTIVE TO UNITS.

CALCULATE THE YEILD OF NH3 in grams IF 8 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 = 4.0 mol , NH3 2 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

STEP THREE: CONVERT OBJECTIVE TO UNITS. CALCULATE THE REQUIRED QUANTITY OF H2 GAS AT STP TO PRODUCE 40 GRAMS OF NH3? N2 + 3H2  2NH3 CONVERT TO GAS VOL VOL = MOLES * 22.4 CONVERT TO PARTICLES PARTICLES = MOLES * 6.02 * 1023 CONVERT TO MOLES VOLUME = MOLES/ M RECOGNIZE: GIVEN IS A MASS IN GRAMS, ANY PHASE. RECOGNIZE GIVEN IS A GAS (g) VOLUME AT STP GIVEN IS IN PARTICLES (ATOMS OR MOLECULES) GIVEN IS AN AQUIOUS SOLUTION (aq) MOLES = MASS/GFM MOLES =VOL(L)/22.4L MOLES = PARTICLES 6.02 * 1023 RATIO MOLES GIVEN TO MOLES OBJECTIVE TO SOLVE FOR MOLES OF OBJECTIVE USE COEFFICIENT OF BALANCED REACTION MOLES =VOLUME * M CONVRERT TO MASS MASS = MOLES * GFM STEP ONE: CONVERT KNOWN TO MOLES. STEP TWO: MOLE RATIO STEP THREE: CONVERT OBJECTIVE TO UNITS.