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erica [24]
3 years ago
11

How many joules of energy are needed to change the temperature of 75.0 g of water 250C?

Chemistry
1 answer:
Phoenix [80]3 years ago
7 0
Answer:

17000 joules

Explanation:

With knowledge of the specific heat capacity of a substance, its mass, and the temperature change, we can convert this to the energy required for this temperature change using:

<span>ΔH=mCΔT</span>, where

<span>ΔH=</span>change in enthalpy (J)

<span>m=</span> mass of substance being heated (g) i.e. water in this question

<span>C=</span> specific heat capacity (J/g°C)

<span>ΔT=</span> change in temperature (°C)

We know mass<span>=65g</span> and <span>ΔT=76°C−12°C=64°C</span>

The specific heat capacity of water is 4.18J/g°C

Therefore, <span>ΔH=65g⋅<span><span>4.18J</span><span>g°C</span></span>⋅64<span>°C</span></span>

<span>=17388.8J</span>

<span>=17000J</span> (2 significant figures)

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Answer:

In a neutral molecule, the sum of the bonding valance electrons must be equal. So the products of the negative element and its charges and the positive element and its charge must be equal.

Explanation:

C1×N1 = C2×N2

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6 0
2 years ago
Explain why vanadium (radius=134 pm) and copper (radius=128 pm) have nearly identical atomic radii, even though the atomic numbe
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</span><span>Regarding the density you can find the density of Cu = 8.96g/cm3 and vanadium = 6.0g/cm3. This also correlates with the idea that if these two atoms have similar volume and one has more mass (more protons;  density is the relationship between m/V), then a bigger mass for a similar volume will result in a bigger density.</span>
7 0
3 years ago
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Answer:

25.45 Liters

Explanation:

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2 years ago
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2 years ago
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