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Savatey [412]
2 years ago
7

Iron has a density of 7.86g/cm^3. Could a block of metal with a mass of 18.2g and a volume of 2.56cm^3 be iron? Show work and ex

plain.
Chemistry
2 answers:
Reptile [31]2 years ago
6 0

Mass=18.2g

Volume=2.56cm^3

=> Density =

=  >  \frac{mass}{volume}

=> Density=

\frac{18.2}{2.56}

=> Density=

7.1g/cm {}^{3}

hjlf2 years ago
5 0

First calculate density of the the metal (should equal to density of iron)

  • Mass=18.2g
  • Volume=2.56cm^3

\\ \bull\tt\longmapsto Density=\dfrac{Mass}{Volume}

\\ \bull\tt\longmapsto Density=\dfrac{18.2}{2.56}

\\ \bull\tt\longmapsto Density=7.1g/cm^3

Metal is not iron

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Answer:

P₂ = 13.79 atm

Explanation:

Given data:

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The given problem will be solved through the Boyle's law,

"The volume of given amount of gas is inversely proportional to its pressure by keeping the temperature and number of moles constant"

Mathematical expression:

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Now we will put the values in formula,

P₁V₁ = P₂V₂

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29. What is E for a system which has the following two steps:
jasenka [17]

Answer:

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Recall that;

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When heat is absorbed by the system q is positive

When heat is evolved by the system q is negative

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When work is done on the system w is positive

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4 0
3 years ago
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melomori [17]

Answer:

0.15M

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You need to calculate the number of moles from the given grams. The molar mass of KOH is (39.098+ 16 +1.008)= 56.106g. To calculate the mols of KOH, \frac{25.0g}{1} × \frac{1 mol}{56.106g} = 0.44558... mol, you see that the grams unit cancel out leaving you with mol as the unit.

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