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Paraphin [41]
3 years ago
10

M (2.1) 2. How many moles is 2.55 x 1026 atoms of Neon? 3 Vou bout 20 r.

Chemistry
1 answer:
Olenka [21]3 years ago
6 0

Answer:

423.44 moles

Explanation:

We need to find no of moles in 2.55\times 10^{26}\ \text{atoms} of Neon.

We know that,

1\ \text{mol of atoms}=6.022\times 10^{23}\ \text{atoms}

2.55\times 10^{26}\ \text{atoms}=2.55\times 10^{26}\ \text{atoms}\times \dfrac{1\ \text{mol}}{6.022\times 10^{23}\ \text{atoms}}\\\\=423.44\ \text{mol}

It means there are 423.44 moles in 2.55\times 10^{26}\ \text{atoms} of Neon.

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How much heat is absorbed in the complete reaction of 3.00 grams of SiO2 with excess carbon in the reaction SiO2(g) + 3C(s) → Si
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31.24 kJ

Explanation:

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If the complete reaction of 1 mol of SiO₂ absorbs 624.7 kJ, then with 0.05 mol:

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Answer:

To release 7563 kJ of heat, we need to burn 163.17 grams of propane

Explanation:

<u>Step 1</u>: Data given

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This means every mole C3H8

Every mole of C3H8 produces 2044 kJ of heat when it burns (ΔH° is negative because it's an exothermic reaction)

<u>Step 2: </u>Calculate the number of moles to produce 7563 kJ of heat

1 mol = 2044 kJ

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x = 7563/2044 =  3.70 moles

To produce 7563 kJ of heat we have to burn 3.70 moles of C3H8

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