How many ammonium Ions NH4^+1 are there in 1.73 mol(NH4)2S? i'm a chemistry test so i need help soon( and btw the 4 and 1 in NH4^+1 are both small numbers and also the 4 and 2 in (NH4)2S) are also small numbers, sorry i forgot what they are called.)

Identify one disadvantage to each of the following models of electron configuration: -dot structures -arrow and line diagrams -written electron configurations type in your answer below. (answer) -dot structures do not show the distribution of electrons in orbitals and take up a lot of space. -arrow and line diagrams take up a lot of space and make it difficult to count electrons. -written configurations make it easy to lose count of electrons and do not show the distribution of electrons in orbitals.

Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .

40dm3 of gas at 760 torr are heated from 5°c to 50°c what is the new volume