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7 sastav smjesa.pdf
• w(H2O) =
0,95 ili 95 %
w(H2O) = 0,93
ili 93 %
w(H2O) = 0,65
ili 65 %
w(H2O) = 0,12
ili 12 %
Maseni udio m(sastojak) w(sastojak,smjesa) =
─────── m(smjesa)
Načinjena je smjesa
od 32,1 g sumpora i 55,8 g željeza. Izračunaj maseni udio sumpora u smjesi.
m(sumpor) = 32,1
g m(željezo) = 55,8 g ───────────── m(smjesa) = 87,9 g m(sumpor) w(sumpor,smjesa) = ─────── m(smjesa) 32,1 g = ───── = 0,365 87,9 g = 36,5 %
U 100 g
vode pri 50 °C otapa se 80 g kalijeva nitrata. Izračunaj maseni udio kalijeva nitrata u zasićenoj otopini pri 50 °C.
m(KNO3) = 80
g m(voda) = 100 g ───────────── m(otopina) = 180 g m(KNO3) w(KNO3,otopina) = ─────── m(otopina) 80 g = ───── = 0,444 180 g = 44,4 %
U 100 g
vode pri 20 °C otapa se 30 g kalijeva nitrata. Izračunaj maseni udio kalijeva nitrata u zasićenoj otopini pri 20 °C.
m(KNO3) = 30
g m(voda) = 100 g ───────────── m(otopina) = 130 g m(KNO3) w(KNO3,otopina) = ─────── m(otopina) 30 g = ───── = 0,230 130 g = 23,0 %
Koliki je maseni
udio magnezija u magnezijevu oksidu ako spaljivanjem 0,500 g magnezija nastene 0,829 g magnezijeva oksida?
w(magnezij, magnezijev oksid)
= m(magnezij) = ————————— m(magnezijev oksid) 0,500 g = ———— = 0,603 = 60,3 %. 0,829 g
Koliko treba uzeti
natrijeva klorida, NaCl, i vode za pripremanje 5 dm3 18 %-tne otopine. Gustoća 18 %-tne otopine natrijeva klorida je 1132 g/dm3.
m(otopina) = V
× ρ = 5 dm3 × 1132 g/dm3 = 5660 g m(NaCl) = m(otopina) × w(NaCl) = 5660 g × 0,18 = 1019 g
Volumni udio φ(sastojak 1,
smjesa) = V(sastojak 1) = ————————————— V(sastojak 1) + V(sastojak 2)
Rashladna smjesa za
hlađenje automobilskih motora zimi priprema se iz "koncentrata" i vode. Koliki je volumni udio "koncentrata" u smjesi koja je dobivena mješanjem 5 L vode i 2 L koncentrata.
φ(koncentrat, smjesa) = V(koncentrat) =
——————————— V(koncentrat) + V(voda) 2 L 2 L = ————— = —— = 0,286 2 L + 5 L 7 L
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