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A is a solution of hydrochloric acid containing 3.60g of Hcl in 1dm³ of solution. B is a solution of impure of sodium carbonate.25cm³ of B require 22.7cm³ of A for complete reaction.Given that 5.00g of impure B was dissolved in 1dm³ solution,what is the percentage by mass of pure sodium carbonate in the impure sample
A mixture is first made of 150 cm3 of a 0.200 mol.dm-3 solution of silver nitrate and ycm3 of a 2.50 mol.dm-3 solution of potassium cyanide. Thereafter, 100 cm3 of a 0.120 mol.dm-3 solution of potassium chloride is added to this mixture and the resulting solution is diluted to 2.00 dm3 . Calculate the value of y that will just prevent the precipitation of silver chloride.
The average atmospheric pressure at sea level is 1.012 × 106 dynes/m2. The value of
g (acceleration of gravity) at sea level is 980 cm/sec2. What is the mass in kg of the
column of air having a cross-sectional area of 1.00 cm2 at the earth’s surface and
extending to the limits of the atmosphere? (Recall that the dyne is a unit of force,
and force = mass × acceleration of gravity.)
- 14g of kno2
a bottle of hydrogen peroxide also known as agua oxigenada is labeled 3% (v/v). How many ml of agua oxigenada are in a 400ml bottle of this solution?
A 10.0 g-sample of potassium bromide is treated with perchloric acid solution. The reaction mixture is cooled and solid KClO4 is removed by filtering, then it is dried and weighed. KBr (aq)+HClO4 (aq) = KClO4 (s)+HBr (aq) The product weighed 8.8 g. What was the percent yield
a) Calculate the molarity of a 5 ppm pesticide solution if the molar mass of the pesticide
435 g/mol.
b) Seawater contains 3.90 x 10¯ 3 ppb of dissolved gold. What volume (in litres) of this seawater would contain 100 g of gold?
Silver metal can be prepared by reducing its nitrate, AgNO 3 with zinc according to the
following equation:
Zn(s) + 2 AgNO 3 (aq) → Zn(NO 3 ) 2 (aq) + 2 Ag(s)
What is the percent yield of the reaction if 93.5 grams of Ag was obtained from 150.5 grams
of AgNO 3 ?
