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balandron [24]
3 years ago
15

State and explain modern periodic table. ⊕⊕

Chemistry
2 answers:
Svetradugi [14.3K]3 years ago
7 0

Explanation:

the physical and chemical properties of an element are periodic functions of their atomic number.

poizon [28]3 years ago
6 0

Answer:modern periodic table is published by Henry Moseley and he believes that ' properties of an elements are periodic function of the atomic number' and he classify the periodic table by groups and perieods so in the modern periodic table there are seven periods and eighteen groups.

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How to do q solution, qrxn, moles of Mg , and delta Hrxn?
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Answer:

<em> 14, 508J/K</em>

ΔHrxn =q/n

where q = heat absorbed and n = moles

Explanation:

<em>m = mass of substance (g) = 0.1184g</em>

1 mole of Mg - 24g

<em>n</em> moles - 0.1184g

<em>n = 0.0049 moles.</em>

Also, q = m × c × ΔT

<em> Heat Capacity, C of MgCl2 = 71.09 J/(mol K)</em>

<em>∴ specific heat c of MgCL2 = 71.09/0.0049 (from the formula c = C/n)</em>

<em>= 14, 508 J/K/kg</em>

ΔT=  (final - initial) temp = 38.3 - 27.2

= 11.1 °C.

mass of MgCl2 = 95.211 × 0.1184 = 11.27

⇒ q = 11.27g × 11.1 °C × <em>14, 508 j/K/kg </em>

<em>= 1,7117.7472 J °C-1 g-1</em>

<em />

<em>∴ ΔHrxn = q/n</em>

<em>=1,7117.7472  ÷ 0.1184 </em>

<em>= 14, 508J/K</em>

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