A gas cylinder can hold $1 k g$ of hydrogen at room temperature and pressure:
Find the number of moles of hydrogen present.

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Solution

A gas cylinder can hold 1 kg
The mass of hydrogen $= 1 k g \times 1000 g / k g = 1000 g$ .
The molar mass of hydrogen is 2 g/mol.
The number of moles of hydrogen present $= \frac{mass}{molar mass} = \frac{1000 g}{2 g / m o l} = 500 m o l$ .

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A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure:Find the number of moles of hydrogen present.

A gas cylinder can hold 1 kg1 kgThe mass of hydrogen =1kg×1000g/kg=1000g.The molar mass of hydrogen is 2 g/mol.The number of moles of hydrogen present =massmolar mass=1000g2g/mol=500mol.

A gas cylinder can hold $1 k g$ of hydrogen at room temperature and pressure:
Find the number of moles of hydrogen present.

A gas cylinder can hold 1 kg
The mass of hydrogen $= 1 k g \times 1000 g / k g = 1000 g$ .
The molar mass of hydrogen is 2 g/mol.
The number of moles of hydrogen present $= \frac{mass}{molar mass} = \frac{1000 g}{2 g / m o l} = 500 m o l$ .