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Science
9th
grade
Molecular Mass and Mole Concept | Atoms and Molecules | Assessment | English | Grade 9
5 questions
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- 1. Multiple Choice
The value of Avogadro’s constant is ___________ .
6.0 × 10²⁴
6.01 × 10²³
6.022 × 10²³
6.022 × 10⁻²³
- 2. Multiple Choice
The number of moles in 32 g of He is ________ .
4
8
16
32
- 3. Multiple Choice
If 12 g of carbon has x atoms, then the number of atoms in 12 grams of magnesium will be ____________ .
x
2x
ˣ⁄₂
1.5x
- 4. Multiple Choice
Molecular mass of NaCl is _____ .
58.5 u
59.25 u
52 u
25 u
- 5. Multiple Choice
What is the number of atoms in 2 mole of Na atoms?
12.044 × 10²² atoms
12.044 × 10²³ atoms
12 × 10⁻²³ atoms
None of the above
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