Mole Concept
How many molecules of water are present in 0.25 mol of H2O?
Select the correct option:
🔒 Solution Hidden from View
Submit your answer to unlock the detailed step-by-step solution.
More some basic concepts in chemistry Practice Questions
How many moles of carbon dioxide are produced when 44 g of carbon dioxide is taken at standard condi...
How many moles of carbon dioxide are produced when 44 g of carbon dioxide is taken at standard condi...
A sample of an oxide of iron contains 7.0 g of iron and 3.0 g of oxygen. If the atomic masses of Fe ...
A sample of an oxide of iron contains 7.0 g of iron and 3.0 g of oxygen. If the atomic masses of Fe ...
How many moles of oxygen atoms are present in 5.0 g of CaCO3? (Atomic masses: Ca=40, C=12, O=16)
How many moles of oxygen atoms are present in 5.0 g of CaCO3? (Atomic masses: Ca=40, C=12, O=16)
A hydrocarbon sample contains 75% carbon by mass and remainder hydrogen. Its empirical formula is (A...
A hydrocarbon sample contains 75% carbon by mass and remainder hydrogen. Its empirical formula is (A...
The limiting reagent in the reaction 2Al + 3Cl2 → 2AlCl3 when 10.0 g Al (M=27) reacts with 20.0 g Cl...
The limiting reagent in the reaction 2Al + 3Cl2 → 2AlCl3 when 10.0 g Al (M=27) reacts with 20.0 g Cl...
At STP, the volume occupied by 2.00 g of H2 gas (M=2) is approximately:
At STP, the volume occupied by 2.00 g of H2 gas (M=2) is approximately:
A sample contains 3.011×10⁺23 atoms of an element. Its mass is 12 g. The element is:
A sample contains 3.011×10⁺23 atoms of an element. Its mass is 12 g. The element is:
The mass percent of nitrogen in NH4 NO3 (Atomic masses: N=14, H=1, O=16) is:
The mass percent of nitrogen in NH4 NO3 (Atomic masses: N=14, H=1, O=16) is:
If 4.4 g of CO2 contains x molecules, what is x? (Molar mass CO2=44 g mol⁻¹)
If 4.4 g of CO2 contains x molecules, what is x? (Molar mass CO2=44 g mol⁻¹)
Determine empirical formula of a compound with 52.17% C, 34.78% O and 13.04% H (Atomic masses: C=12,...
Determine empirical formula of a compound with 52.17% C, 34.78% O and 13.04% H (Atomic masses: C=12,...
When 9.0 g of aluminium reacts completely with oxygen, how many grams of Al2O3 are formed? (2Al + 3/...
When 9.0 g of aluminium reacts completely with oxygen, how many grams of Al2O3 are formed? (2Al + 3/...
Which statement is correct regarding Avogadro's hypothesis?
Which statement is correct regarding Avogadro's hypothesis?
About This Question
- Subject
- chemistry
- Chapter
- some basic concepts in chemistry
- Topic
- mole concept
- Difficulty
- Easy
- Year
- 2025
Solution
- Avogadro's Number (NA): 1 mol=6.022×1023 particles.
- Calculate Molecules:
- Total molecules=Moles×NA
- Total molecules=0.25 mol×6.022×1023 mol−1
- Total molecules≈1.5055×1023.
- Scientific Notation: Rounding correctly for the options gives 1.5×1023 molecules.
This easy difficulty chemistry question is from the chapter some basic concepts in chemistry, covering the topic of mole concept. It appeared in the 2025 exam.
Looking for more practice? Explore all chemistry questions or browse some basic concepts in chemistry questions on RankGuru.