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iogann1982 [59]
2 years ago
12

4. Balance the following chemical equation. Say what the coefficients "a"

Chemistry
1 answer:
lisabon 2012 [21]2 years ago
6 0

Answer:

a = 4

b = 3

Explanation:

<u>SOLUTION :-</u>

Balance it by using 'hit & trial' method , and you'll get the answer :-

2Fe₂O + 3C → <u>4</u>Fe + <u>3</u>CO₂

⇒ a = 4 ; b = 3

<u></u>

<u>VERIFICATION :-</u>

<em>In reactant side of equation :-</em>

  • Number of atoms in Fe = 2×2 = 4
  • Number of atoms in O = 2×3 = 6
  • Number of atoms in C = 3×1 = 3

<em>In product side of equation :-</em>

  • Number of atoms in Fe = 4×1 = 4
  • Number of atoms in C = 3×1 = 3
  • Number of atoms in O = 3×2 = 6

Number of atoms of each element is equal in both reactant & product side of equation. Hence , the equation is balanced.

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Answer: The specific heat of the unknown metal is 0.897J/g^0C

Explanation:

The quantity of heat required to raise the temperature of a substance by one degree Celsius is called the specific heat capacity.

Q=m\times c\times \Delta T

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c = specific heat capacity = ?

Initial temperature of the water = T_i

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Change in temperature ,\Delta T=T_f-T_i=(64.7)^0C

Putting in the values, we get:

5040=86.8\times c\times 64.7^0C

c=0.897J/g^0C

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In france grapes are 1.83 euros per kilogram. What is the cost of grapes in dollars per pound if the exchange rate is 1.40 dollars per euro

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