When a metal x is treated with cold water, it gives a base y with molecular formula xoh (molecular mass = 40) and liberates a gas z which easily catches fire. Identify x, y and z?
Answers
Answered by
32
x= sodium ( Na)
y= sodium hydroxide ( NaOH)
z= hydrogen gas
y= sodium hydroxide ( NaOH)
z= hydrogen gas
Answered by
0
Answer:
Explanation:Molecular mass of
X + O + H
=40
→
X+16+1=
40
→
X
=
23
Only Na has the molecular mass of 23. Therefore, X is sodium and Y is sodium hydroxide as it has molecular mass 40.
Sodium on reaction with cold water gives out sodium hydroxide, hydrogen gas and heat energy. The reaction occurs as follows:
2
Na(s)
+
2
H
2
O(cold)
→
2
NaOH(aq)
+
H
2
(g)
+
Heat energy
Hydrogen gas easily catches fire. Therefore, Z is hydrogen gas.
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