To test the effectiveness of a gunpowder mixture, 1 gram was exploded under controlled stp conditions, and the reaction chamber was found to expand to 310 cm3. what volume would these gases occupy at the temperature produced by an uncontrolled explosion (2,200°c) and 2.1 atmospheres of pressure? 5,900 cm3 1,300 cm3 7.7 x 104 cm3 1,000 cm3

The volume of the gas at given temperature is

Explanation:

= initial pressure of gas = 1 atm

= initial temperature of gas =

= initial volume of gas =

( , 1 mL = 0.001 L)

..[1]

= final pressure of gas = 2.1 atm

= final temperature of gas =

= final volume of gas = ?

..[2]

By dividing [1] and [2] we get combined gas equation :,

Now put all the given values in the above equation, we get:

The volume of the gas at given temperature is

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

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