The number of moles of AlBr3 = Molarity × Volume
= 0.150 × 0.3
= 0.045 moles
1 mole of AlBr3 gives 3 moles of Br- ions
That is
AlBr3 = Al3+ + 3Br-
Therefore, 0.045 moles of AlBr3 will yield 3 × 0.045 = 0.135 moles
Thus; they are 0.135 moles of bromide ions
Answer:
Heating is the best method
Explanation:
When a mass of crystals containing Water of crystallization is heated sufiiciently to a high temperature, water vapor may be driven off the crystals by the action of heat alone.
Answer:
(d) 4.5 M
Explanation:
We have 70.0 mL of 3.0-molar Na₂CO₃. The moles of Na₂CO₃ are:
70.0 × 10⁻³ L × 3.0 mol/L = 0.21 mol
There are 2 moles of Na⁺ in 1 mole of Na₂CO₃. The moles of Na⁺ in 0.21 moles of Na₂CO₃ are 2 × 0.21 mol = 0.42 mol
We have 30.0 mL of 1.0-molar NaHCO₃. The moles of NaHCO₃ are:
30.0 × 10⁻³ L × 1.0 mol/L = 0.030 mol
There is 1 mole of Na⁺ in 1 mole of NaHCO₃. The moes of Na⁺ in 0.030 moles of NaHCO₃ are 1 × 0.030 mol = 0.030 mol
The total number of moles of Na⁺ is 0.42 mol + 0.030 mol = 0.45 mol
The total volume is 70.0 mL + 30.0 mL = 100.0 mL
The concentration of Na⁺ is
0.45 mol / 0.1000 L = 4.5 M
Answer:
for the first question, the context is necessary in order to answer...
Fat is immiscible (does not mix) with water because fat is nonpolar and water is polar (remember like dissolves like: polar mixes with polar, nonpolar with nonpolar).
soap bubbles by having many soap molecules surround fat molecules with their nonpolar end, and direct their polar ends outwards.
For your second question:
Dirt and oil are nonpolar. When we wash our bodies with water (which is polar) it does not do a good job in removing these nonpolar molecules. Soap, on the other hand, has a long nonpolar end and a small polar end. The nonpolar end of the soap molecule attaches to the dirt and oil on your skin and when the water from the shower head hits the soap, it pulls the dirt, oil, and soap off of you by attaching itself to the polar end of the soap molecule.
Explanation: