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expeople1 [14]
3 years ago
12

If you were asked to convert 4.2 × 1022 atoms of aluminum to moles, which of the following should you use for the conversion?

Chemistry
2 answers:
ZanzabumX [31]3 years ago
8 0
<span><span>4.2×<span>1022</span></span><span>/N<span>A is a: </span></span></span><span>
</span><span><span /><span>N_{A} is~ the~ Avogadro ~number</span></span>6.022 x 10^23~ a/m(a/m)= atoms and moles

<span><span /></span><span><span /></span>
gregori [183]3 years ago
4 0
You should use Avogadro’s number for the conversion, because Avogadro’s Law states that there are 6.02 x 10^23 atoms per 1 mol of that substance.
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For a particular isomer of C8H18, The following reaction produces 5093.7 KJ of heat per mole of C8H18(g) consumed under standere
Aleks04 [339]
02(g) = 0 kj/mol 
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</span>5094kJ = [8(-393.5) + 9(-241.8)] - [X + 12.5(0)] 
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<span>-5094 kJ = -5324.2 - x </span>

<span>add -5324.2 to -5094 </span>
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7 0
3 years ago
What quantity of heat is required to raise the temperature of 460g of aluminum from 15C to 85C?
Hoochie [10]

Answer:

Q = 28.9 kJ

Explanation:

Given that,

Mass of Aluminium, m = 460 g

Initial temperature, T_i=15^{\circ} C

Final temperature, T_f=85^{\circ}

We know that the specific heat of Aluminium is 0.9 J/g°C. The heat required to raise the temperature is given by :

Q=mc\Delta T\\\\Q=mc(T_f-T_i)\\\\Q=460\ g\times 0.9\ J/g^{\circ} C\times (85-15)^{\circ} C\\\\Q=28980\ J\\\\\text{or}\\\\Q=28.9\ kJ

So, 28.9 kJ of heat is required to raise the temperature.

6 0
3 years ago
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murzikaleks [220]

Answer:

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Explanation:

This intimate association is because reproductive processes are energetically expensive, and the brain must temper the fertility of individuals to match nutritional availability.Reproduction function in mammals can be inhibited when food availability is low or when increased energy demands are not met by compensatory food intake such as in short-term and chronic withdrawal of nutrients.This very close alignment with the food supply is more important in females, where pregnancy and lactation are linked to considerable energetic expenses, needed for the nurture of embryos and newborns. In fact, her reproductive outcome can be seriously altered and even life threatening to both the mother and offspring when nutritional imbalance occurs. In order to keep constant body energy stores, in mammals, a series of homeostatic events leading to maintenance of energy balance are activate when a state of energy scarcity or abundance occurs.

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3 years ago
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Ede4ka [16]

Answer:

A lot, because it belt inclined at an angle of 36.9° above the horizontal.

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5 0
2 years ago
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The difference between the two is that the values in discontinuous variation are fixed, while the values in continuous variation can be changed. :)
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