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3.12 g of oxygen is adsorbed on 1.2 g of platinum metal. Find the volume of oxygen adsorbed per gram of the adsorbent at 1 atm and 300 K.
$[R = 0.0821\ \text{L atm K}^{-1}\ \text{mol}^{-1}]$
Molar mass of O$_2 = 32\ \text{g/mol}$. Moles of O$_2 = \dfrac{3.12}{32} = 0.0975\ \text{mol}$
Total volume at 1 atm, 300 K: $V = \dfrac{nRT}{P} = \dfrac{0.0975 \times 0.0821 \times 300}{1} \approx 2.40\ \text{L}$
Volume per gram of adsorbent (Pt) $= \dfrac{2.40}{1.2} = \mathbf{2.00}\ \text{L g}^{-1}$
Which US President introduced the 'New Deal'?
Franklin D. Roosevelt (FDR) launched the New Deal programs to address the Great Depression in the 1930s.
In acute pulmonary edema, fluid accumulates in the alveoli, causing severe dyspnea and hypoxia. The High Fowler's position (sitting upright at 90°) with legs dangling off the side of the bed is the priority intervention because:
- Gravity pulls fluid away from the lungs (reduces venous return to the heart)
- Dependent legs act as venous pooling areas (reduces preload)
- Upright position maximizes diaphragmatic descent and lung expansion
- Improves ventilation-perfusion matching
Additional nursing interventions in pulmonary edema:
- High-flow oxygen or CPAP/BiPAP
- IV furosemide (diuretic) — reduces fluid overload
- IV morphine — reduces anxiety and vasodilates
- Stop IV fluids or drastically reduce rate
- Cardiac monitoring
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