Answer:
C. Scientific laws describe phenomena that can be observed in nature
Explanation:
Answer:
0.0063 mol
Explanation:
Step 1: Write the balanced combustion equation
C₈H₁₈(l) + 12.5 O₂(g) ⇒ 8 CO₂(g) + 9 H₂O(g)
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of C₈H₁₈ to CO₂ is 1:8.
Step 3: Calculate the number of moles of C₈H₁₈ needed to produce 0.050 moles of CO₂
0.050 mol CO₂ × 1 mol C₈H₁₈/8 mol CO₂ = 0.0063 mol C₈H₁₈
Molality can be expressed by moles of solute over kilograms of solvent. the question asks the molality of 0.25m NaCI is equal to 0.25 moles of NaCI over 1kg of water.
A mixture is two or more substances that have been combined together but each substance is not changed chemically.Examples of mixtures include:<span>1. Sea water. This is a mixture of water and various salts.</span><span>2. Gunpowder. This is a mixture of potassium nitrate, sulfur and carbon. </span><span>3. Crude oil. This is a mixture of organic compounds, mainly hydrocarbons.</span><span>4. Ink. This is a mixture of colored dyes which can be separated using chromatography.</span><span>5. Dry air. Air is a mixture of nitrogen,oxygen, argon, carbon dioxide, neon and tiny traces of other gases.</span>