<span>The </span>ΔH value is -22kcal
D(Cr) = 8,96 g/cm3
<span>M(Cr) = 63,546 g/mol </span>
<span>In a cell face centred cubic, there are 4 atoms of Cur . . . ! </span>
<span>n(Cr in 1 cm3) = m(Cu) / M(Cr) </span>
<span>n(Cr in 1 cm3) = 8,96 / 63,546 </span>
<span>n(Cr in 1 cm3) = 0,141 mol of Cr </span>
<span>Avogadro's number is : NA = 6,02•10^23 mol^-1 </span>
<span>N(Cr) = n(Cu) x NA </span>
<span>N(Cr) = 0,141 x 6,02•10^23 </span>
<span>N(Cr) = 8,488•10^22 atoms of Cr </span>
<span>N(cell) = N(Cu) / 4 </span>
<span>N(cell) = 8,488•10^22 / 4 </span>
<span>N(cell) = 2,122•10^22 cells in 1 cm3</span>
Answer:
About 0.53 g of carbon dioxide needs to be added.
Explanation:
Recall the ideal gas law:
To determine the amount of carbon dioxide we need, we need to solve for <em>n: </em>
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Recall that <em>P</em>, <em>V</em>, and <em>T</em> are in atm, L, and K, respectively. <em>R</em> is the universal gas constant.
Convert all values into the correct units:
Volume:
Temperature:
And pressure:
Substitute and evaluate:
Convert moles to grams:
In conclusion, about 0.53 g of carbon dioxide needs to be added.
Answer:
how will water affect the force of friction
90% sure
Answer:
A Energy leaves the iron bar and enters the wood until the temperature are equal.
Explanation:
According to the law of conservation of energy or the first law thermodynamics energy neither be created nor destroyed, energy is transferred from one form to another form.