Question #78c3c

1 Answer
MeneerNask
Feb 19, 2017

There's not enough data to identify M. It could be any of the group 1 metals (except maybe Lithium). Let's keep calling it M.

Explanation:

Burning in air:
4M+O_2->2M_2O so X=M_2O

X reacting with water:
M_2O+H_2O->2MOH so Y=MOH

M reacting with water:
2M+2H_2O->2MOH+H_2 so Z=H_2

Y being heated:
2MOH->M_2O+H_2O

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