Molality = moles Pb(NO3)2/ Kg H2O
373.5 g Pb(NO3)2 X (1 mole/ 331.2 grams)= 1.13 moles Pb(NO3)2
2.00 x 10^3 g (1 Kg/ 1000g)= 2 Kg
Molality= 1.13 moles/ 2 Kg= 0.565 molal.
When an atom has an equal number of electrons and protons it has an equal number of negative charge (the electrons) and positive electric charges (the protons). The total electric charge of the atomic is therefore zero
It’s A: C2H2N (basically you count how many C, H and N there are)