What is the concentration of nitrate ions when 8g Cu(NO3)2.2.5H20 is dissolved and the diluted to 600ml?

Question

What is the concentration of nitrate ions when 8g Cu(NO3)2.2.5H20 is dissolved and the diluted to 600ml?

Answer 1

find moles using the molar mass :

? moles = 8 g @ 232.59 g / mol Cu(NO3)2.2.5H2O = 0.0344 moles of Cu(NO3)2.2.5H2O

0.0344 moles of Cu(NO3)2.2.5H2O --> twice --> 0.0688 moles nitrate

find molarity:

0.0688 moles / 0.600 litres = 0.1147 Molar nitrate

again your data has very little in sig figs showing, so chose your answer if your data actually had more sig figs than the "1" that I can see:

your answer (3sig figs) : 0.115 Molar nitrate

your answer (2sig figs) : 0.12 Molar nitrate

your answer (1sig figs) : 0.1 Molar nitrate