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What is the molality of particles in a solution containing 15.1g of KBr disolved in 780g of water?
NWCH
NWCH
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What is the molality of particles in a solution containing 15.1g of KBr disolved in 780g of water?
I am having trouble solving this chemistry problem and would appreciate it if someone could tell me how to solve this problem step by step. Thanks!!
What is the molality of particles in a solution containing 15.1g of KBr disolved in 780g of water?
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juliejusu
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15.1g/molar mass of KBr and then divide it by 0.780 kg water
answer mine?
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tony51092
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1. Find molar mass, then divide mass by molar mass.
K = 39.10 g.mol
Br = 79.90 g.mol
Molar mass: 39.10 g/mol + 79.90 g.mol = 119 g.mol
2. Divide mass by molar mass to get moles:
n = m / M, where n = moles, m = mass, M = molar mass
n = 15.1 g / 119 g/mol = 0.126
3. Molality is the moles solute divided by kilograms solvent.
m = 0.126 mol / 0.780 kg = 0.162 molal
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