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2 years ago

How many zn atoms are contained in 922 g of zn

1 answer:

3 0

To determine the number of zinc atoms from a given mass of zinc metal, we need to convert the mass into moles by using the atomic mass of zinc which is 65.38 grams per mole. Then, we use the Avogadro's number to convert it to number of atoms. It represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. We do as follows:

Moles Zn = 922 g ( 1 mol / 65.38 g ) = 14.10 mol
no. of Zn atoms = 14.10 mol Zn ( 6.022 x 10^23 atoms / mole ) = 8.49x10^24 atoms Zn

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dolphi86 [110]

Greetings!

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Hope this helps.
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2 years ago

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DochEvi [55]

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what is the specific heat of a substance if 300 j are required to raise the temperature of a 267-g sample by 12 degrees c

slava [35]

Answer : The specific heat of the substance is 0.0936 J/g °C

Explanation :

The amount of heat Q can be calculated using following formula.

$Q = m \times C \times \bigtriangleup T$

Where Q is the amount of heat required = 300 J

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C is the specific heat of the substance.

We want to solve for C, so the equation for Q is modified as follows.

$C = \frac{Q}{m \times \bigtriangleup T}$

Let us plug in the values in above equation.

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2 years ago

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vichka [17]

Answer:

False

Explanation:

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