H2 burns in chlorine to produce hydrogen chloride. The exact mass of Cl2 required to convert 4g H2 into HCI according to the following equation H2+Cl2 ---> 2HCl is:
Correct answer: C. 142 g
- A. 35.5g
- B. 71 g
- C. 142 g
- D. 71.5 g
Explanation
H2 + Cl2-> 2HCl Moles of H2 = mass/mr = 4/2 = 2 The molar ratio of H2 and Cl2 is H2 : Cl2 = 1 : 1 So, moles of Cl2 = 2 moles Mr of Cl2= 35.5 x 2 = 71 g/mole Mass of Cl2 = mole x Mr = 2 x 71 = 142g
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About Fundamental Concepts of Chemistry
Mole calculations connect mass, number of particles and Avogadro's number, while balanced equations provide the mole ratios used in stoichiometry. Questions cover limiting and excess reactants, theoretical yield and percentage yield, including identifying which reactant is consumed first and comparing the actual product with the maximum possible product.
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