The analysis of compounds is a fundamental process in chemistry that involves determining the elements and their quantities within a given compound. This process can be qualitative, identifying the elements, or quantitative, measuring the exact amount of each element.
What is the unit of relative atomic mass?
The unit of relative atomic mass is atomic mass unit (amu).
Who first discovered the phenomenon of isotopy?
The phenomenon of isotopy was first discovered by Frederick Soddy.
What is a limiting reagent in a chemical reaction?
A limiting reagent is that which controls the quantities of products formed in a chemical reaction.
How many atoms of carbon are present in 1 mole of glucose?
1 mole of glucose has 6 atoms of carbon.
What role does stoichiometry play in the analysis of compounds?
Stoichiometry helps in calculating the relationships between reactants and products in a chemical reaction, which is crucial for quantitative analysis.
What is the empirical formula of the compound with a molecular mass of 110.15 g/mol and containing 65.44% carbon, 5.50% hydrogen, and 29.06% oxygen?
a) C3H3O
b) C6H6O2
c) CH3O
d) C2H2O2
Answer: b) C6H6O2
What is the percentage yield of SiC when 100 kg of sand reacts with excess carbon to produce 51.4 kg of SiC?
a) 65%
b) 77%
c) 82%
d) 90%
Answer: b) 77%
What is the molar mass of water (H2O)?
a) 16 g/mol
b) 18 g/mol
c) 20 g/mol
d) 14 g/mol
Answer: b) 18 g/mol
Calculate the percentage of nitrogen and phosphorus in (NH4)3PO4.
a) Atoms with different numbers of electrons
b) Atoms with the same number of neutrons
c) Atoms with the same number of protons but different mass numbers
d) Atoms with different chemical properties
Answer: c) Atoms with the same number of protons but different mass numbers
What is the percentage composition of oxygen in water (H2O)?
a) 66.67%
b) 33.33%
c) 88.89%
d) 44.44%
Answer: c) 88.89%