Answer:
1.758 x 10⁻¹¹.
Explanation:
∵ pH = - log[H⁺].
∴ 5.47 = -log[H⁺].
log[H⁺] = -5.47.
∴ [H⁺] = 3.388 x 10⁻⁶ M.
∵ [H⁺] = √(Ka.C)
∴ [H⁺]² = Ka.C
<em>∴ Ka = [H⁺]²/C </em>= (3.388 x 10⁻⁶)²(0.653) = <em>1.758 x 10⁻¹¹.</em>
Answer:
Heat going into a substance changes it from a solid to a liquid or a liquid to a gas. Removing heat from a substance changes a gas to a liquid or a liquid to a solid.
Liquid → Gas:
VaporizationGas → Liquid:
CondensationSolid → Liquid:
Melting or fusion
Solid → Gas: Sublimation
Explanation:
Answer is: the mass of the carbon is 14.57 grams.
m(H) = 2.45; mass of hydrogen in sample of acetone.
n(H) = m(H) ÷ M(H).
n(H) = 2.45 g ÷ 1.01 g/mol.
n(H) = 2.425 mol; amount of hydrogen.
From molecular formula of acetone: n(C) : n(H) = 3 : 6 (1 : 2).
n(C) = 2.425 mol ÷ 2.
n(C) = 1.212 mol; amount of carbon in the sample.
m(C) = n(C) · M(C).
m(C) = 1.212 mol · 12.01 g/mol.
m(C) = 14.57 g.
