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Sidana [21]
2 years ago
10

A 2.76 g ingot of silver metal absorbs 78 J of energy. What is the final temperature of the metal if it is initially at 47 C?

Chemistry
1 answer:
Aneli [31]2 years ago
8 0

Answer:

The initial temperature of the ... What is the specific heat capacity of silver metal if 55.00 g of the metal.

Explanation:

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PLS HELP THE QUESTION IS ON THE PICTURE
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<u>Concepts used:</u>

1 mole of an element or a compound has 6.022 * 10²³ formula units

So, we can say that: <em>Number of formula units = number of moles * 6.022*10²³</em>

number of moles of an element or a compound = given mass/molar mass

<u>__________________________________________________________</u>

<u>003 - </u><u>Number of CaH₂ formula units in 6.065 grams</u>

Number of Moles:

We know that the molar mass of CaH₂ is 42 grams/mol

Number of Moles of CaH₂ = given mass/molar mass

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Number of Formula units:

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= 0.143 * 6.022 * 10²³

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<u>004 </u><u>- Mass of 6.34 * 10²⁴ formula units of NaBF₄</u>

Number of Moles:

We mentioned this formula before:

<em>Number of formula units = number of moles * 6.022*10²³</em>

Solving it for number of moles, we get:

Number of moles = Number of Formula units / 6.022* 10²³

replacing the variable

Number of moles = 6.34 * 10²⁴ / 6.022*10²³

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Mass of 10.5 moles of NaBF₄:

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Mass of 10.5 moles = 10.5 * 38

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Number of Moles:

We have the formula:

Number of moles = Number of Formula units / 6.022* 10²³

replacing the variables

Number of Moles = 9.78 * 10²¹ / 6.022*10²³

Number of Moles = 1.6 / 10²

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