Zinc chloride and aluminum
Answer:
30.25°C
Explanation:
The calorimeter is an equipment used to measure the combustion enthalpy of a substance. The heat loss in the reaction is used to heat the water and the equipment. By the conservation of energy:
Qcombustion + Qcalorimeter + Qwater = 0
Because there is no phase change:
Qcalorimeter = C*ΔT, where C is the heat capacity, and ΔT the variation in temperature (final - initial)
Qwater = m*c*ΔT, where m is the mass, and c is the specific heat (4.184 J/g°C).
The molar mass of lactose is 342.3 g/mol, so the number of moles in 2.50 g is:
n = mass/molar mass
n = 2.50/342.3
n = 0.0073 mol
Qcombustion = -5652 kJ/mol * 0.0073 mol
Qcombustion = -41.28 kJ
Qcombustion = - 41280 J
Thus,
-41280 + 1630*(T - 24.58) + 1350*4.184*(T - 24.58) = 0
(T - 24.58) * (1630 + 5648.4) = 41280
7278.4(T - 24.58) = 41280
T - 24.58 = 5.67
T = 30.25°C
Hello,
Aluminium is a metal with 13 as its atomic number, in such a way, one could foresee the Lewis structure via its electron configuration:
Al^{13}: 1s^22s^22p^63s^23p^1
It is seen that in its last level, 3, there are three electrons, two from 3s^2 and one from 3p^1, in such a way one states that aluminium has three valence electrons which are equal to the electrons at its outer shell. The Lewis representation for aluminium is shown on the attached picture.
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Explanation:
Structural Formulas v. Empirical Formulas
An empirical formula (like a molecular formula) lacks any structural information about the positioning or bonding of atoms in a molecule. It can therefore describe a number of different structures, or isomers, with varying physical properties. For butane and isobutane, the empirical formula for both molecules is C2H5, and they share the same molecular formula, C4H10. However, one structural representation for butane is CH3CH2CH2CH3, while isobutane can be described using the structural formula (CH3)3CH.