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lana [24]
3 years ago
15

How much heat is needed to raise the temperature of a 5.0 gram block of aluminum from 22.0°c to 37.0°c?

Chemistry
2 answers:
Reptile [31]3 years ago
3 0
You'll need the specific heat capacity of aluminium to solve this question.
H=(0.005)(37-22)(specific heat capacity of aluminium)

dimulka [17.4K]3 years ago
3 0

Answer: 67.65 Joules

Explanation:

Q= m\times c\times \Delta T

Q= heat gained

m= mass of the substance = 5.0 g

c = heat capacity of aluminium = 0.902 J/g ° C      

\Delta T={\text{Change in temperature}}=(37-22)^oC=15^0C  

Q=5.0g\times 0.902J/g^oC\times 15^oC

Q= 67.65 Joules

Thus heat gained by 5.0 g of aluminum is = 67.65 Joules

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A mixture of hydrogen and argon gases is maintained in a 6.47 L flask at a pressure of 3.43 atm and a temperature of 85 °C. If t
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Answer:

The mixture contains 8.23 g of Ar

Explanation:

Let's solve this with the Ideal Gases Law

Total pressure of a mixture = (Total moles . R . T) / V

We convert T° from °C to K → 85°C + 273 = 358K

3.43 atm = (Moles . 0.082 L.atm/mol.K . 358K) / 6.47L

(3.43 atm . 6.47L) / (0.082 L.atm/mol.K . 358K) = Moles

0.756= Total moles from the mixture

Moles of Ar + Moles of H₂ = 0.756 moles

Moles of Ar + 1.10 g / 2g/mol = 0.756 moles

Moles of Ar = 0.756 moles - 0.55 moles H₂ → 0.206

We convert the moles to g → 0.206 mol . 39.95 g / 1 mol = 8.23 g

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