Answer:
The answer to your question is the letter d.
Explanation:
Data
Zn + HCl ⇒ ZnCl₂ + H₂
- Calculate the Oxidation number of reactants and products
Zn⁰ + H⁺¹Cl⁻¹ ⇒ Zn⁺²Cl₂⁻¹ + H₂⁰
- Determine which elements changed their oxidation numbers
Zn⁰ ⇒ Zn⁺² Zn lost 2e⁻
2H⁺¹ ⇒ H₂⁰ H won 2 e⁻
-Interchange the electrons lost and won
2( Zn⁰ ⇒ Zn⁺²)
2(2H⁺¹ ⇒ H₂⁰)
-Simplify
2Zn⁰ ⇒ 2Zn⁺²
4H⁺¹ ⇒ 2H₂⁰
-Substitute the coefficient in the equation
2Zn + 4HCl ⇒ 2ZnCl₂ + 2H₂
Reactant Element Product
2 Zn 2
4 H 4
4 Cl 4
- Now the reaction is balanced
Answer:
C₆H₈O₇ = 192 g/mol
Explanation:
Molar mass is the sum of the atomic weight of the atoms present in compound.
Formula of citric acid:
C₆H₈O₇
Atomic weight of hydrogen = 1 amu
Atomic weight of carbon = 12 amu
Atomic weight of oxygen = 16 amu
C₆ = 6 × 12 = 72 g/mol
H₈ = 8 × 1 = 8 g/mol
O₇ = 7 × 16 = 112 g/mol
C₆H₈O₇ = 72 g/mol + 8 g/mol + 112 g/mol
C₆H₈O₇ = 192 g/mol
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