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liq [111]
3 years ago
12

A sample of a substance has a mass of 78.9 g and a volume of 84.3 cm3 what is the density?

Chemistry
1 answer:
SpyIntel [72]3 years ago
3 0

Answer:

d = 0.936 g/cm3

Explanation:

m = 78.9 g

V = 84.3 cm3

m = V × d

=> d = m/V = 78.9/84.3 = 0.936 g/cm3

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1. a receptacle in a church for the water used in baptism, typically a freestanding stone structure.

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Explanation:

There are mutiple definitions of font

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Calculate how many moles of element Q are in 23.53 g of element Q.
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Answer:

0.579 moles

Explanation:

Moles = 23.53/40.64

= 0.5789 moles

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How does the reactivity of nonmetals change as you move from left to right across the periodic table?
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Explanation:

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3 years ago
The surface of what he can act like a sort of skin due to a Liquid called
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3 years ago
How much (Q) heat is needed to melt 35 g of iodine? Hf = 61.7 J/g.
aev [14]

Taking into account the definition of calorimetry and latent heat, a heat of 2159.5 J is needed to melt 35 g of iodine.

<h3>Calorimetry</h3>

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

<h3>Latent heat</h3>

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

<h3>Heat needed to melt iodine</h3>

In this case, you know:

  • m= 35 g
  • L=61.7 \frac{J}{g}

Replacing in the definition of latent heat:

Q= 35 g× 61.7 \frac{J}{g}

Solving:

<u><em>Q=2159.5 J</em></u>

Finally, a heat of 2159.5 J is needed to melt 35 g of iodine.

Learn more about calorimetry:

brainly.com/question/14057615

brainly.com/question/24988785

brainly.com/question/21315372

brainly.com/question/13959344

brainly.com/question/14309811

brainly.com/question/23578297

#SPJ1

8 0
2 years ago
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