4. Just before a thunderstorm, a student fills a balloon with a volume of 22.4 Liters of Helium at temperature of 24.5 °C and 0.97 atm of pressure. Determine how many moles of Helium are contained in the balloon.

What does a numerical subscript following an element in a chemical formula mean?

Suppose you discovered a new element with 120 protons and 2 electrons in its outer level . i'm what group does this new element belong? what properties would you expect it to have

T(s) in2os] (m) 0 185 2.39 546 1.90 725 1.70 the decomposition of n205 can be described by the equation 2.68 given these data for the reaction at 45°c in carbon tetrachloride solution, calculate the average rate of reaction for each successive time interval. ntr s to 185 s 185 s to 546 s 546 s to 725 s number number number reaction rate: m/s m/s m/s