%Mass
Ar C = 12 g/mol, Mr C₄H₁₀ = 58 g/mol, Ar H = 1 g/mol

or

Answer:
D
Explanation:
Scientists always perform tests and observe and measure in the physical world to prove their points or answer their questions.
potassium reacts the most vigorously.
Answer:
Hello
you're answer should be E.HOCH2CH2OH
hope this answer is correct
-2 for O
-1 for F
0 for N2
+1 for Li
+3 for Fe