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84 g of nitrogen reacts with hydrogen to form 102 g of ammonia. Calculate the mass of the hydrogen required for the reaction. g of hydrogen.

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A person travels from Spain to the United States, where the temperature is measured in degrees Fahrenheit instead of degrees Celsius. How would you make the conversion between one system and another? To…

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Describe the rooms, furnishings and conveniences of this home. Compare life there for the owners and the servants.

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At 7.09 a.m. the air-raid alarm sounded and four American B-29 aeroplanes appeared in the sky. (…). At 7.31 a.m. the siren sounded to announce that the bombing was over. Thinking they were safe now,…

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6.1. A time of change In today's industrialised world, the rural farming population has almost completely disappeared. It now represents just 4.4 % of the working population. Moreover, the working…

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Rewrite the sentences and correct the mistakes: After the 9/11 attacks, the USA declared a war on terrorism, invading Afghanistan in 2002 and Iraq in 2003. The reunification of the USSR happened in…

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