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if 30 g of calcium carbonte react with 20 g of HCl, how many grams of CO2 will produce?
An indicator is a weak acid and pH range of its colour change is 3.1 to 4.5.if the neutral point of indicator in the center of this pH range,What is ionization constant of the indicator?
  1. 10 mol of Zn react with 10 mol of HCl. Calculate the number of moles of H2 produced.

                (a) 5 mol                            (b) 10 mol

               (c) 20 mol                            (d) 2.5 mo

How many protons are there in 6.0 g of nitrogen gas? Avogadro constant, L = 6.022 × 1023 mol–1
A 30 cm3 sample of nitrogen was reacted with a 60 cm3 sample of fluorine according to the equation
What is the volume of the gas mixture after the reaction, at constant temperature and pressure?
Which substance is used to reduce titanium(IV) chloride in the extraction of titanium metal?
A student has a 10 cm3 sample of 1.00 × 10–2 mol dm–3 methanoic acid solution. The student is asked to dilute the methanoic acid solution to a concentration of
2.00 × 10–4 mol dm–3 by adding distilled water.
Which volume of water should be added?
A gas cylinder contains 5.0 kg of propane.
How many propane molecules are in the cylinder? The Avogadro constant, L = 6.022 × 1023 mol–1
A 4.85 g sample of anhydrous sodium sulfate is dissolved in water and the solution made up to 250 cm3 in a volumetric flask.
What is the concentration in mol dm−3 of sodium sulfate in the solution?
What is the empirical formula of an oxide of nitrogen that contains 26% nitrogen by mass?
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