The speed of a comet traveling around causes a tail trailing behind it.
EDTA is a complex used to determine water hardness. The reaction between EDTA and CaCO₃ is in 1:1 ratio. To solve this problem, we must know the moles of CaCO₃ present (otherwise we can't solve the problem). Suppose you have 0.5 moles of CaCO₃. Since the ratio is 1:1, it would also need 0.5 moles EDTA. Then,
Volume = Moles/Molarity = 0.5 moles/0.05 M = 10 L of EDTA
Answer:
547 L of water vapour
Explanation:
Equation of reaction: 2[CaSO4.2H20] + Heat ---> 2[CaSO4.½H2O] + 3H20
From the equation of reaction above, 2 moles of gypsum when heated produces 2 moles of plaster of Paris and 3 moles of water vapour.
Molar mass of gypsum = 172 g/mol
Molar mass of H2O = 18 g/mol
Therefore, 2 * 172 g of gypsum produces 3 * 18 g of water vapour
i.e. 344 g of gypsum produces 54 g of H2O
2 Kg(2000 g) of gypsum will produce (54 * 2000)/344 g of water vapour = 313.95 of water vapour.
Volume of water vapour produced = mass/density
Volume of water vapour = 313.95 g/ 0.574 g/L = 547 L of water vapour
Therefore 547 L of water vapour are produced
<h2> part A : </h2><h2>The mass % of KCl =
17.78 %</h2>
<u>calculation </u>
mass%= mass of the solute/mass of the solvent x100
mass of the solute 40 g
mass of the solvent=225
% mass= 40/225 x100=17.78%
<h2>
Part B</h2><h3>The mole fraction of ionic species =0.04296</h3>
the mole fraction=moles of KCl/ moles of the solution
moles of KCl= 40 g/74.5 g/mol=0.537 moles
moles of water = 225g/18 g/mol=12.5 moles
mole fraction is therefore= 0.537/12.5=0.04296