xarianna2007
07.09.2021 •
Chemistry
Emily found a piece of metal. She doesn't know what kind of metal it is. What might she measure in lab to find out what type of metal it is? Is this a physical or chemical property?
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Ответ:
Emily can measure the density of the piece of metal to find out what it is. Density is a physical property.
Explanation:
The density of a substance can be found by dividing its mass by its volume. No chemical reaction is involved in measuring the mass nor the volume; therefore, density is a physical property.
Ответ:
166 g/mol
Explanation:
Step 1: Write the neutralization reaction
H₂A + 2 NaOH ⇒ Na₂A + 2 H₂O
Step 2: Calculate the reacting moles of NaOH
48.3 mL of 0.0700 M NaOH react.
0.0483 L × 0.0700 mol/L = 3.38 × 10⁻³ mol
Step 3: Calculate the reacting moles of H₂A
The molar ratio of H₂A to NaOH is 1:2. The reacting moles of H₂A are 1/2 × 3.38 × 10⁻³ mol = 1.69 × 10⁻³ mol.
Step 4: Calculate the molar mass of H₂A
1.69 × 10⁻³ moles of H₂A have a mass of 0.281 g. The molar mass of H₂A is:
M = 0.281 g / 1.69 × 10⁻³ mol = 166 g/mol