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Romashka [77]
3 years ago
6

A 90.0 g sample of an unknown metal absorbed 25.6 J of heat as its temperature increased 1.18 degrees C. What is the specific he

at of the metal
Chemistry
1 answer:
jenyasd209 [6]3 years ago
8 0

The specific heat of the metal is 241.05 J/kg°C

<h3>What is specific heat capacity?</h3>

Specific heat capacity can be defined as the amount of heat required to raise a unit mass of metal through 1 °C

To calculate the specific heat capacity of the metal, we use the formula below.

Formula:

  • Q = cm(t'-t)............... Equation 1

Where:

  • Q = Heat absorbed by the metal
  • c = specific heat capacity of the metal
  • m = mass of the metal
  • Δt = increase in temperature

make c the subject of the equation

  • c = Q/m(Δt)................. Equation 2

From the question,

Given:

  • Q = 25.6 J
  • m = 90 g = 0.09 kg
  • Δt = 1.18 °C

Substitute these values into equation 2

  • c = 25.6/(1.18×0.09)
  • c = 241.05 J/kg°C

Hence, the specific heat capacity of the metal is 241.05 J/kg°C.

Learn more about specific heat capacity here: brainly.com/question/21406849

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Answer :

The molar mass of ibuprofen is, 206.29 g/mole.

The number of moles of ibuprofen in a single tablet is, 0.000969 moles

The number of moles of ibuprofen in four doses is, 0.007752 moles

Solution : Given,

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Molar mass of hydrogen = 1.01 g/mole

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1) Now we have to calculate the molar mass of ibuprofen.

Molar mass of ibuprofen, C_{13}H_{18}O_2 = (13\times 12.01)+(18\times 1.01)+(2\times 15.99)=206.29g/mole

The molar mass of ibuprofen = 206.29 g/mole

2) Now we have to calculate the moles of ibuprofen.

Formula used : Moles=\frac{Mass}{\text{ Molar mass}}

Given : Mass of ibuprofen = 200 mg = 0.2 g         (1 mg = 1000 g)

\text{ Moles of ibuprofen}=\frac{\text{ Mass of ibuprofen}}{\text{ Molar mass of ibuprofen}}=\frac{0.2g}{206.29g/mole}=0.000969moles

The moles of ibuprofen = 0.000969 moles

3) Now we have to calculate the number of moles of ibuprofen for four doses.

Number of tablets in one dose = 2

Total number of tablets in 4 doses = 4 × 2 = 8

Number of moles of ibuprofen in 8 tablets =

\text{ Number of moles of ibuprofen in 1 tablet}\times \text{ Total number of tablets}=0.000969\times 8=0.007752moles

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Answer:

See solution.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to set up the formula for the calculation of the by-mass percentage of the metal:

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Regards!

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