19 moles of gas are in a flask at 21degc as well as 697, Chemistry

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19 moles of gas are in a flask at 21degc as well as 697

1.9 moles of gas are in a flask at 21°C as well as 697 mmHg. Explain the flask was opened and 10.5g of gas X was added to the flask. If the pressure changed to 795 mmHg and the temperature of the mixture was 26°C in the flask.
(a) Explain how many moles of gas total are in the flask after the addition of gas X?
(b) Explain how many moles of gas X were added to the flask?
(c) Explain what the identity of gas X is O2, Cl2 or NO2?

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Chemistry: 19 moles of gas are in a flask at 21degc as well as 697

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