Answer:
The concentration given here is in terms of molality which is moles of solute per kg of solution. Therefore, we multiply the concentration by the total mass of the solution and obtain the moles of solute. We can convert this into grams and calculate for the solvent.
0.630 mol KBr / kg solution ( .086 kg solution ) = 0.0542 mol KBr
0.0542 mol Kbr ( 119.002 g / 1 mol ) = 6.4475 g KBr
Mass of solvent = 86 - 6.4475 = 79.55 g water
Explanation:
a) Under constant pressure conditions, volume is directly proportional to the temperature. i.e,
V α T
V1/T1 = V2/T2 -----(1)
It is given that: V2 = 1/3 V1
Substituting for V2 in equation (1) gives:
1/T1 = 1/3T2
i.e. T2 = (1/3) T1
2) Based on the ideal gas equation:
PV = nRT
Under constant n and R
P1V1/T1 = P2V2/T2
P2 = (P1V1/T1)*T2/V2 = (4*5.5/300)*250/2 = 9.17 atm
3) As per Raoult's Law, partial pressure of a gas is equal to the product of mole fraction and the total gas pressure
Mole fraction of Ne = 0.50/0.50 + 1.20 = 0.294
Total pressure = 730 torr
Partial Pressure of Ne = 0.294*730 = 215 torr
Crystal structure usually formed by a solid compound
This structure usually a highly ordered structure, composed of a set of atoms that arranged in a particular way which form a symmetric pattern that caused the structure is hard and hard to break
hope this helps
Hello!
An amino acid has five basic parts. An amino group, a carboxyl group, a central carbon atom, a hydrogen, and a R group.
The r group is the side chain specific to each amino acid. The r group varies between each kind of amino acid, while everything else stays the same. Therefore, the r group decides the identity of the amino acid.
Hope this helps! Let me know if you need a more specific explanation.
Bohr's model explained the position of the electron, proton, and neutron in the atom of the element. The energy at the n = 2 level of the atom will be - 3.40 eV.
<h3>What is the principal quantum number (n)?</h3>
The principal quantum number (n) has been the distance of the electron of that atom in the nucleus and its energy in the structure. It can also be said to define the size of the atomic orbit.
n = 2 is the first excited state whose energy is calculated as:
Eₙ = − 13.6 ÷ n² eV
E₂ = - 13.6 eV ÷ 2²
= -3.40 eV
Therefore, -3.40 eV is the energy of electron at n = 2.
Learn more about principal quantum numbers here:
brainly.com/question/14307071
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