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Answer :
Final answer:
The ratio of mass of reactants in the chemical reaction H_2 + Cl_2 → 2HCl is 1:35.5. This is based on the atomic masses of hydrogen (1 for each atom, 2 for H_2) and chlorine (35.5 for each atom, 71 for Cl_2), and the ratio of H_2 to Cl_2 in the reaction is 1:1.
Explanation:
The correct answer for the ratio of mass of reactants in the chemical reaction H_2 + Cl_2 → 2HCl is C) 1:35.5. This is based on the atomic masses of hydrogen (H_2) and chlorine (Cl_2).
In a reaction between hydrogen and chlorine, one molecule of hydrogen (H_2) reacts with one molecule of chlorine (Cl_2) to produce two molecules of Hydrogen Chloride (HCl). Here, the atomic weight of Hydrogen (H) is approximated as 1, and Chlorine (Cl) is approximated as 35.5 (typical atomic weights). Therefore, for a whole molecule of hydrogen (H_2), the mass would be 2(1) = 2. For a whole molecule of chlorine (Cl_2), the mass would be 2(35.5) = 71. However, the ratio of H_2 to Cl_2 in the reaction is 1:1, hence, the mass ratio is 2:71 (or simplified to 1:35.5).
Chemical reactions are often dependent not just on the number of individual atoms, but on the mass of the substances as well. The ratio of the reactants' masses directly factors into how much product is generated by the reaction.
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Final answer:
The ratio of the mass of reactants in the chemical reaction H_2 + Cl_2 → 2HCl is 1:71 (B). This value is obtained by considering the ratio of molecular weights of the gases.
Explanation:
The chemical reaction in question is Hydrogen reacting with Chlorine to produce Hydrogen Chloride, represented as H_2 + Cl_2 → 2HCl. From this equation, you can see that you need 1 mole of Hydrogen gas (with a molar mass approximately equal to 2g/mole) and 1 mole of Chlorine gas (with a molar mass approximately equal to 70.9 g/mole) to produce 2 moles of Hydrogen Chloride.
Therefore, the ratio of the mass of reactants Hydrogen to Chlorine will be 2:70.9 (considering the molecular weights of H2 and Cl2), which rounded to one significant figure becomes 2:71, as masses in such reactions are usually considered in g/mole. So, the answer is B) 1:71.
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