An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8

D. 693.8.

Explanation:

The first scale of the triple beam balance indicate that the mass is 600.The second scale of the triple beam balance indicate that the mass is 690.The third scale of the triple beam balance indicate that the mass is higher that 693.5 and the scale is near but lower than 694, so the mass = 693.8.c

They are all decomposition reactions.

Matter- occupies space and possesses rest massno matter is the opposite