Answer:
4.506g/cm³
Explanation:
Check attachment
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Answer:
Born-Haber Process - "Born-Haber process applies Hess's law to calculate the lattice enthalpy(<em>this is a thermodynamic term which equals to the total heat content of a system</em>), by comparing the standard enthalpy change of formation of ionic compound (from the elements) to the enthalpy required to make gaseous ions from the elements".
Explanation:
Now the calculations done for SRI2 are as follows:
- Enthalpy of Sublimation of Sr(s)= 164 kJ per mol,
- 1st ionization energy of Sr(g)=549 kJ per mol,
- 2nd ionization energy of Sr(g)=1064 kJ per mol,
- Enthalpy dissociation energy of I2(s)= 62.4 kJ per mol,
- Bond dissociation energy of I2(g)= 152.55 kJ per mol,
- 1st electron affinity of I(g)= -295.15 kJ per mol,
- Lattice energy of SrI2(s)=-1959.75 kJ per mol.
Note - the terms mentioned in the brackets are as, S- solid form, g- Gaseous form.
Answer:
Mohamed Osama El Sayed El kordy
Answer:
D. 450 J/kgK
Explanation:
Using the formula as follows:
Q = m × c × ∆T
Where:
Q = amount of heat absorbed/released (J)
m = mass of substance (g)
c = specific heat capacity
∆T = change in temperature (°C)
According to the information provided in this question:
Q = 267.3 kJ = 267300J
m = 18kg
∆T = 318K - 285K = 33K
c = ?
Q = m × c × ∆T
c = Q ÷ m∆T
c = 267300 ÷ 18 × 33
c = 267300 ÷ 594
c = 450 J/kgK
Answer: b. positive charge is concentrated in the center of the atom
Explanation:
Ernest Rutherford conducted a series of experiments together with Hans Geiger and Ernest Marsden; in order to corroborate <em>Thomson's plum pudding atomic model </em>(positive and negative charges evenly distributed in the atom).
However the results of the experiment led him to find out there is a concentration of positive charge in the atom's core (which was later called nucleus) surrounded by electrons. This lead to a new atomic model, in which the atom has a positive charged nucleus surrounded by negative charged particles that move similar to the orbit of the planet around the Sun.
So, according to this model, atoms are mostly empty space with a positively charged core.