An expandable balloon contains 1800 L of He at 0.883 atm pressure and 25 ºC. At an altitude of 22 miles (temperature 2.6 ºC and pressure 2.8 torr), what will the volume of the balloon be?

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

Are you going to give an example of the plant or?

The total number of electrons in a lewis dot structure for co2 is 16

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