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    				| 1. | 
                                    A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure:Find the number of moles of hydrogen present. | 
                            
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Answer»  1 kg = 1000 grams 2 g of hydrogen molecules = 1 mole 1 g of hydrogen molecules = 1/2 mole 1000 g of hydrogen molecules = 1/2 x 1000 = 500 moles  | 
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