Answer:
The molality is 0,89
Explanation:
A molal solution indicates the moles of solute in 1 kg of solvent (1000 g). First, we calculate the weight of 1 mol of NaCl:
Weight NaCl= Weight Na + Weight Cl=23g + 35,5 g=58,5 g/mol
58,5 g----1 mol NaCl
5,2 g----x=(5,2 gx1 mol NaCl)/58,5 g=0,089 mol NaCl
100g water-----0,089 mol NaCl
1000g water----x=(1000g waterx0,089 mol NaCl)/100 g water
x=0,89 mol NaCl----> 0,89 m
