A mixture of three gases has a total pressure of 950 torr. The second gas exerts 370 torr, the third exerts 58 kPa. What pressure does the first gas gas exert? 230 torr
1465 torr
145 torr
522 torr
805 torr
435 torr

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

the answer is c.the valence of the atoms combine .

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