<span>Answer: 100 ml
</span>
<span>Explanation:
1) Convert 1.38 g of Fe₂S₃ into number of moles, n
</span>i) Formula: n = mass in grass / molar mass
<span>
ii) molar mass of </span><span>Fe₂S₃ =2 x 55.8 g/mol + 3 x 32.1 g/mol = 207.9 g/mol
</span>
iii) n = 1.38 g / 207.9 g/mol = 0.00664 moles of <span>Fe₂S₃
</span>
<span>2) Use the percent yield to calculate the theoretical amount:
</span>
<span>65% = 0.65 = actual yield/ theoretical yield =>
</span>theoretical yield = actual yield / 0.65 = 0.00664 moles / 0.65 = 0.010 mol <span>Fe₂S₃</span><span>
3) Chemical equation:
</span>
<span> 3 Na₂S(aq) + 2 FeCl₃(aq) → Fe₂S₃(s) + 6 NaCl(aq)
4) Stoichiometrical mole ratios:
</span>
<span>3 mol Na₂S : 2 mol FeCl₃ : 1 mol Fe₂S₃ : 6 mol NaCl
5) Proportionality:
</span>2moles FeCl₃ / 1 mol Fe₂S₃ = x / 0.010 mol Fe₂S₃
<span>
=> x = 0.020 mol FeCl₃
6) convert 0.020 mol to volume
</span>
<span>i) Molarity formula: M = n / V
</span>
<span>ii) V = n / M = 0.020 mol / 0.2 M = 0.1 liter = 100 ml
</span>
Fungi and bacteria release nitrogen stored in dead tissue through a decomposition process called B) ammonification.
The atomic mass is defined as the mass an atom of an element. The atomic mass in approximation is equal to the sum of number of neutrons and protons in the nucleus of an atom (mass number). The units which are used for measuring the atomic mass is atomic mass unit,
.
Thus, the correct option is option E that is atomic mass unit is used for measuring atomic mass.
Answer:
12
Explanation:
because that plot and the iron
The value of x in CuSO4. xH2O is 5.
Given that;
Number of moles of anhydrous salt = Number of moles of hydrated salt
Number of moles of anhydrous salt = 319 × 
Mass of hydrated salt = 499 ×
g
Number of moles of anhydrous salt = 319
g/160 g/mol = 0.00199 moles
Number of moles of hydrated salt = 499 ×
g/ 160 + 18x
0.00199 = 499 ×
g/ 160 + 18x
0.00199 (160 + 18x) = 499 ×
0.318 + 0.036x = 0.499
0.036x = 0.499 - 0.318
0.036x = 0.181
x = 0.181/0.036
x = 5
Hence, x in CuSO4. xH2O is 5.
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