Answer:

Explanation:
1. Calculate the moles of copper(II) hydroxide

2. Calculate the molecules of copper(II) hydroxide
Answer:
C
Explanation:
If you add enough heat to a solid it eventually becomes a liquid
<u>Moseley</u> discovered that <u>elements</u> with similar properties occurred at <u>regular intervals</u> when the elements were arranged in order of increasing
<u>"</u><u> </u><u>Atomic number </u><u>"</u>
We first need to convert grams of hydrogen chloride to moles.
molarity = moles of solute/liters of solution
To convert from grams to moles, we need to divide by it's molecular mass.
4.5 g HCl * (1 mole HCl/ 36.46 g HCl) = 0.123 moles HCl
0.12 moles/0.9 L = 0.13 M HCl
If they gave you the volume as 900 mL, then that would be 3 sig figs. And the sig figs would be limited to 2 because the mass.If, however, they gave you the volume as 0.9 L, then that would be 1 sig fig. And the final answer would be limited to to 1 sig fig.