Molality is defined as the number of moles of solute in 1 kg of solvent.
since density and volume has been given we can calculate the mass of water
mass = density x volume
mass = 1.00 g/mL x 1620 mL = 1620 g
number of moles of glucose - 257 g / 180 g/mol = 1.43 mol
number of moles of glucose in 1620 g - 1.43 mol
therefore number of moles in 1000 g - 1.43 mol / 1.620 kg = 0.883 mol/kg
therefore molality is 0.883 mol/kg
me too please l need to know how to use this
Answer:
C. Protect them from predators because their calcium carbonate exterior allows them to withstand an attack from their predators in their specific environment.
Explanation:
They build layers to protect themselves from predators. Plus, I've seen this question and got it right.
Sunlight because solar panels Create electrical energy
Answer:
Na2CO3 + 2HC2H3O2 --> CO2 + H2O + 2NaC2H3O2 (note my corrections to your original post)
2Na^+ + CO3^-2 + 2HC2H3O2 ==> CO2 + H2O + 2Na^+ + 2C2H3O2^-
Now cancel the ions common to each side to arrive at the net ionic equation. To be a little more accurate, place an (aq) after each ion or solution.
ur correct answer
Explanation:
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