Topic
Q:
The half-life of Palladium-100 is 4 days. After 20 days a samit? of Palladium-100 has been reduced to a
mass of 2 mg .
What was the initial mass (in mg ) of the sample?
What is the mass 4 weeks after the start?
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Q:
pH readings for wines vary from 2.5 to 3.5 . Find the corresponding range of hydrogen ion concentrations.
\( 3.16 \times 10^{-4} \leq\left[\mathrm{H}^{+}\right] \leq 3.16 \times 10^{-3} \)
\( 3.5 \times 10^{-4} \leq\left[\mathrm{H}^{+}\right] \leq 2.5 \times 10^{-3} \)
\( 3.16 \times 10^{-11} \leq\left[\mathrm{H}^{+}\right] \leq 3.16 \times 10^{-10} \)
\( 3.5 \times 10^{-11} \leq\left[\mathrm{H}^{+}\right] \leq 2.5 \times 10^{-10} \)
None of these
Q:
The pH readings for wines vary from 2.5 to 3.5 . Find the corresponding range of hydrogen ion concentrations.
\( 3.16 \times 10^{-4} \leq\left[\mathrm{H}^{+}\right] \leq 3.16 \times 10^{-3} \)
\( 3.5 \times 10^{-4} \leq\left[\mathrm{H}^{+}\right] \leq 2.5 \times 10^{-3} \)
\( 3.16 \times 10^{-11} \leq\left[\mathrm{H}^{+}\right] \leq 3.16 \times 10^{-10} \)
\( 3.5 \times 10^{-11} \leq\left[\mathrm{H}^{+}\right] \leq 2.5 \times 10^{-10} \)
None of these
Q:
Calculate the pressure of a gas if 15 mol occupies 50 L at \( 35^{\circ} \mathrm{C} \)
Q:
Estequiometría masa-volumen.
Ejemplo No. 1:
¿cuántor litros de amoniaco se producirán con 10 gramos de hidro
\( \frac{3 \mathrm{H}_{2}}{}+\mathrm{N}_{2} \rightarrow \underline{2 \mathrm{NH}_{3}} \)
Q:
20. Which compound is covalent?
Q:
\& Qhé volumen de hidrógeno se producirá en condiciones, namales?
\[ \mathrm{Mg}+2 \mathrm{HCl} \rightarrow \mathrm{MgCl}_{2}+\mathrm{H}_{2} \text { - } \]
Q:
¿qué volumen en condictances normales ocupan 0.5 mary de \( H_{3} \) ?
Q:
Calculate the density, in grams per liter, of a gas at STP if 3.04 L of the gas at \( 11.2^{\circ} \mathrm{C} \) and 715.5 mmHg weighs 0.400 g .
Q:
If \( \mathrm{He}(\mathrm{g}) \) has an average kinetic energy of \( 6650 \mathrm{~J} / \mathrm{mol} \) under certain conditions, what is the root mean square speed of \( \mathrm{Cl}_{2}(\mathrm{~g}) \)
molecules under the same conditions?
root mean square speed:
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