Basic Concept of Chemistry
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A piece of metal is 3 inch (represented by in) long. What is its length in cm?
A jug contains 2L of milk. Calculate the volume of the milk in m3
A compound contains 4.07 % hydrogen, 24.27 % carbon and 71.65 % chlorine. Its molar mass is 98.96 g. What are its empirical and molecular formulas ?
Calculate the amount of water (g) produced by the combustion of 16 g of methane.
How many moles of methane are required to produce 22 g CO2 (g) after combustion?
Calculate the molarity of NaOH in the solution prepared by dissolving its 4 g in enough water to form 250 mL of the solution.
Fill in the blanks in the following conversions:(i) 1 km = …………………. mm = …………………. pm(ii) 1 mg = …………………. kg = …………………. ng(iii) 1 mL = …………………. L = …………………. dm3
Calcium carbonate reacts with aqueous HCl to give CaCl2 and CO2 according to the reaction, CaCO3 (s) + 2 HCl (aq) → CaCl2 (aq) + CO2(g) + H2O(l) What mass of CaCO3 is required to react completely with 25 mL of 0.75 M HCl?
Calculate the number of atoms in each of the following (i) 52 moles of Ar (ii) 52 u of He (iii) 52 g of He.
Dinitrogen and dihydrogen react with each other to produce ammonia according to the following chemical equation:N2 (g) + H2 (g) -> 2NH3 (g)(i) Calculate the mass of ammonia produced if 2.00 × 103 g dinitrogen reacts with 1.00 ×103 g of dihydrogen.(ii) Will any of the two reactants remain unreacted?(iii) If yes, which one and what would be its mass?
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