C. Ta
Tantalum is an element with an atomic number of 63 and its electronic configuration is:
[Xe] 4f¹⁴ 5d³ 6s²
From the calculation, the molar mass of the solution is 141 g/mol.
<h3>What is the molar mass?</h3>
We know that;
ΔT = K m i
K = the freezing constant
m = molality of the solution
i = the Van't Hoft factor
The molality of the solution is obtained from;
m = ΔT/K i
m = 3.89/5.12 * 1
m = 0.76 m
Now;
0.76 = 26.7 /MM/0.250
0.76 = 26.7 /0.250MM
0.76 * 0.250MM = 26.7
MM= 26.7/0.76 * 0.250
MM = 141 g/mol
Learn more about molar mass:brainly.com/question/12127540?
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Answer:
C.
Explanation:
...........................
Answer:
755.625 kj
Explanation:
Given data:
Heat released by two mole of H₂ = 241.8 Kj
Heat released by 12.5 grams of H₂ = ?
Solution:
Number of moles of hydrogen:
Number of moles = mass/ molar mass
Number of moles = 12.5 g/ 2 g/mol
Number of moles = 6.25 mol
Chemical equation:
2H₂ + O₂ → 2H₂O + 241.8 kj
Now we will determine the heat released by 6.25 moles of hydrogen.
2 mole = 241.8 kj
1 mole =241.8 kj/2 = 120.9 kj
120.9 kj × 6.25 = 755.625 kj
Idk what the last answer is but it's because we get sweat all over and it cools us