Multiple Choice
An alloy used in aerospace applications contains 15.0 g of titanium in a 120.0 g sample. What is the mass percent of titanium in the alloy?
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3. Chemical Reactions
Mass Percent
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A nitrogen oxide is 63.65% by mass nitrogen. The molecular formula could be:
A
NO
B
NO2
C
N2O
D
N2O4
E
either NO2 or N2O4
Verified step by step guidance1
Step 1: Begin by understanding the problem. We need to determine which molecular formula corresponds to a nitrogen oxide that is 63.65% nitrogen by mass.
Step 2: Calculate the molar mass of each compound option. For example, for NO, calculate the molar mass using the atomic masses of nitrogen (N) and oxygen (O). Use the formula: \( \text{Molar Mass} = \text{Atomic Mass of N} + \text{Atomic Mass of O} \).
Step 3: Determine the mass percentage of nitrogen in each compound. Use the formula: \( \text{Mass Percentage of N} = \left( \frac{\text{Mass of N in the compound}}{\text{Molar Mass of the compound}} \right) \times 100 \).
Step 4: Compare the calculated mass percentage of nitrogen for each compound with the given percentage (63.65%). Identify which compound has a nitrogen mass percentage closest to 63.65%.
Step 5: Conclude which molecular formula matches the given nitrogen mass percentage. The correct formula will have a nitrogen mass percentage that matches or is very close to 63.65%.
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