2.Which letter represents a balanced chemical reaction A. 2Zn + 2HCI - 2ZnCl2 +2H2
B. 22n + 3HCI - 3ZnCl2 +2H,
C. Zn + 2HCl - ZnCl2 +H,
D. Zn + 3HCI - ZnCl2 +H,
Ο Α
OB
ос
OD

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Asample of tin (ii) chloride has a mass of 0.49 g. after heating, it has a mass of 0.41 g.  what is the percent by mass of water in the hydrate?   %

How does the value of the equilibrium constant show that a reaction reaches equilibrium very quickly? (a) the equilibrium constant is large. (b) the equilibrium constant is small. (c) the equilibrium constant is zero. (d) the value of the equilibrium constant does not show how quickly a reaction comes to equilibrium.