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nexus9112 [7]
2 years ago
14

In clinical applications, the unit parts per million (ppm) is used to express very small concentrations of solute, where 1 ppm i

s equivalent to 1 mg of solute per 1 L of solution. Calculate the concentration in parts per million for each of the solutions. There is 25 μg of calcium in a total volume of 57 mL .

Chemistry
1 answer:
Norma-Jean [14]2 years ago
3 0

Answer: 25 μg of calcium in a total volume of 57 mL to ppm is 0.4386ppm

Explanation:

Please see the attachments below

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=> Moles in 13g of KMnO4 = \frac{Mass}{Relative-atomic-mass} = \frac{13}{158} = 0.082278.. = 0.08 moles

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In a heat engine, 700 J of heat enters the system, and the piston does 400 J of work. What is the final internal (thermal) energ
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The first law of thermodynamics characterises the two types of energy transfer, as heat and as thermodynamic. The final internal (thermal) energy of the system is 1,500 J.

<h3>What is internal energy?</h3>

The energy present in a system itself for conducting reactions is called internal energy.

Given,

  • Heat entering system (Q) = 700 J
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According to the <u>first law of thermodynamics</u>:

\rm Q = \Delta U + W

Substituting values in the above equation:

\begin{aligned}\rm Q &= \rm U_{2} - U_{1} + W\\\\\rm U_{2}  &= \rm Q - W + U_{1}\\\\\rm U_{2}  &= 700 - 400 + 1200\\\\&= 1500 \;\rm J\end{aligned}

Therefore, option D. 1500 J is the final energy.

Learn more about internal energy here:

brainly.com/question/2602565

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