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3 years ago

Which scientist bombarded gold sheets with alpha particles to look at the atom?

Chemistry

1 answer:

Alekssandra [29.7K]3 years ago

6 0

the correct scientist is rutherford

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Show me step by step solution

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Ok I may be young but combine the two reactions to create a compund

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3 years ago

When you slide a box across the floor what force must your push be stronger than?

weeeeeb [17]

If I remember correctly, the answer is <span>Friction force.</span>

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3 years ago

List 10 uses of metals

KatRina [158]

Answer:

1.In electronics

2 In medicine

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10 Bullion market

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3 years ago

[Rn] 7s25f6d4<br> Which element is denoted

Colt1911 [192]

Answer:

Explanation:

[Rn] 7s25f6d4

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3 years ago

Calculate the standard reaction enthalpy for the reaction NO2(g) → NO(g) + O(g) given +142.7 kJ/mol for the standard enthalpy of

bulgar [2K]

Answer:

The standard reaction enthalpy for the given reaction is 235.15 kJ/mol.

Explanation:

$O_2(g) \rightarrow \frac{2}{3}O_3(g),\Delta H^o_{1}=142.7 kJ/mol$ ..[1]

$O_2(g) \rightarrow 2 O(g),\Delta H^o_{2}=498.4 kJ/mol$ ..[2]

$NO(g) + O_3(g)\rightarrow NO_2(g) + O_2(g) ,\Delta H^o_{3} = -200 kJ/mol$ ..[3]

$NO_2(g)\rightarrow NO(g) + O(g),\Delta H^o_{4}=?$ ..[4]

Using Hess's law:

Hess’s law of constant heat summation states that the amount of heat absorbed or evolved in a given chemical equation remains the same whether the process occurs in one step or several steps.

2 × [4] = [2]- (3 ) × [1] - (2) × [3]

$2\times \Delta H^o_{4}=\Delta H^o_{2} -3\times \Delta H^o_{1}-2\times \Delta H^o_{3}$

$2\times \Delta H^o_{4}=498.4 kJ/mol-3\times 142.7 kJ/mol-2\times -200 kJ/mol$

$2\times \Delta H^o_{4}=470.3 kJ/mol$

$\Delta H^o_{4}=\frac{470.3 kJ/mol}{2}=235.15 kJ/mol$

The standard reaction enthalpy for the given reaction is 235.15 kJ/mol.

7 0

3 years ago