The answer is B, the electrolysis of water. One cannot be the answer since the condensation of steam requires a loss of heat, an exothermic reaction. Numbers 2 and 3 cannot be correct either as they do not indicate energy in the chemical equation, and so it must be balanced throughout. Meaning that the only possible answer is B.
+2, because Beryllium is in the Group II of the periodic table.
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T1 = 14⁰C = 273 +14= 287 K
T1 = 29⁰C =273 +29 = 302 K
V1 = 4.5 L
P = constant
T1/T2 = V1/V2
287/302 = 4.5/V2
V2= 302*4.5/287 = 4.7L
V2 = 4.7 L
Answer:
Explanation:
No of electrons, n = 20
We need to find the total charge. We can use quantization of electric charge in this case.
Net charge,
q = ne
e is charge on an electron
So, there are of charge in 20 electrons.
Answer:
The limiting reactant is AlCl₃ and the excess reactant is NaOH.
Explanation:
- The balanced equation for the mentioned reaction is:
<em>3NaOH(aq) + AlCl₃(aq) → 3NaCl(aq) + Al(OH)₃(s)↓,</em>
It is clear that 3.0 moles of NaOH(aq) react with 1.0 mole of AlCl₃(aq) to produce 3.0 moles of NaCl(aq) and 1.0 mole of Al(OH)₃(s).
- Firstly, we need to calculate the no. of moles of (8.0 g) of NaOH and (4.0 g) of AlCl₃:
no. of moles of NaOH = mass/molar mass = (8.0 g)/(40.0 g/mol) = 0.2 mol.
no. of moles of AlCl₃ = mass/molar mass = (4.0 g)/(133.34 g/mol) = 0.03 mol.
- From stichiometry; NaOH reacts with AlCl₃ with (3: 1) molar ratio.
∴ 0.09 mol of NaOH (the remaining 1.1 mol is in excess) reacts completely with 0.03 mol of AlCl₃.
<em>the limiting reactant is AlCl₃ and the excess reactant is NaOH.</em>
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