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3 years ago

11

What is the isotopic notation for radon -198

1 answer:

ipn [44]3 years ago

8 0

Answer:

All radon isotopes have 86 protons (Z=86).
But radon-222 has 136 neutrons (86 + 136 = 222).
Whereas radon- 220 has only 134 neutrons (86 + 134 = 220).
The chemical symbol for radon is Rn, and the mass number is usually placed either after the symbol (Rn-222) or to the left and above it (222Rn).

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When 1.04g of cyclopropane was burnt in excess oxygen in a bomb calorimeter, the temperature rose by 3.69K. The total heat capac

STatiana [176]

Answer:

$\Delta _{comb}H=-2,093\frac{kJ}{mol}$

Explanation:

Hello!

In this case, since these calorimetry problems are characterized by the fact that the calorimeter absorbs the heat released by the combustion of the substance, we can write:

$Q_{rxn}+Q_{cal}=0$

Thus, given the temperature change and the total heat capacity, we obtain the following total heat of reaction:

$Q_{rxn}=-14.01kJ/K*3.69K\\\\Q_{rxn}=-51.70kJ$

Now, by dividing by the moles in 1.04 g of cyclopropane (42.09 g/mol) we obtain the enthalpy of combustion of this fuel:

$n=\frac{1.04g}{42.09g/mol}=0.0247mol\\\\\Delta _{comb}H=\frac{Q_{rxn}}{n}\\\\ \Delta _{comb}H=-2,093\frac{kJ}{mol}$

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4 0

3 years ago

3. Complete the following conversions.

Tasya [4]

A. 0.0105 kg
b. 1570 m
c. 3.5x10^-6
d. 3500000
e. 1000 mL
f. 0.000358 m3
g. 548.6 cm3

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3 years ago

lana66690 [7]

Answer:

c

Explanation:

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3 years ago

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What is common to all elements in the same group on the periodic table? Their properties are very different.

Mrac [35]

Hello,

<span>B.They have the same number of valence electrons. </span>

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3 years ago

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PLEASE HELP!!!!! I need help with this question!

Ivahew [28]

Answer:

Exothermic Reaction

Explanation:

Its a combustion reaction and they are always exothermic in nature.

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3 years ago