The Law of Constant Proportions states that:
AReactions only happen at room temperature
BAll elements weigh the same
CAll compounds have the same mass
DIn a given compound, the elements are always present in the same fixed proportion by mass
Answer & Solution
Correct answer: D. In a given compound, the elements are always present in the same fixed proportion by mass
In a given chemical compound (like water — H₂O), the constituent elements (hydrogen, oxygen) are always combined in the same fixed proportion by mass — regardless of source. Water from a river or made in a lab is always 11.1% hydrogen and 88.9% oxygen by mass.
Related questions
Decomposing 9 g of pure water gives how much hydrogen?An atom with fewer than four valence electrons will usually:Sodium chloride has sodium and chlorine in the mass ratio:If 12 g of carbon combines with 32 g of oxygen, the carbon dioxide formed is:CO is named carbon:Which prefix indicates four atoms?CO2 is named:The water molecule is represented as: