Question

Calculate the grams of solute needed to prepare each of the following solutions. Part A 1.0 L of a 3.0 M NaOH solution Express your answer using two significant figures. IVO AP R O 2 ? g NaOH Submit Request Answer Part B 5.5 L of a 0.40 M CaCl2 solution Express your answer using two significant figures. OVO ACOM O a ? m= g CaCl2 Submit Request Answer Part 190 mL of a 2.75 M NaNO3 solution Express your answer using three significant figures. V A¢ O O ? g NaNO3 Submit Request Answer

Answer 1

(A) To find the mass of NaOH Given that 10 L of a 3.0 M NaOH solution First find the moles of NaOH moles molarity xvolume = 3.0mol/Lx10L = 3.0m oles To find the mass of NaOH mass moles xmolarmass molarmass of NaOH 40 g/ mol mass 3.0moles x40 g/mol = 120 g Hence the mass of NaOH= 120g (B) To find the mass of CaCl Given that 5.5 L of a 0.40 M CaCl soluti on First find the moles of CaCl moles molarty xvolume = 0.40mo1/Lx5.5L - 2.2moles To find the mass of CaCl mass moles Xmolarm ass molarmass of CaCl2 110.98g /mol mass 2.2mol x110.98g/mo 244g Hence the mass of CaCl 244g

(c) To find the mass of NaNO3 Given that 190 mL of a 2.75M NaNO3 solution First find the moles of NaNO moles molarity xvolume 190 mL 0.190L =275mol/L x0.190L = 0.5225moles To find the mass of NaNO3 mass moles xmolarmass molarmass of NaNO3 84.91g/mol mass 0.5225mol x 84.91g mol - 44.3g Hence the mass of NaNO3 44.3g