Agas occupies a volume of 458 ml at a pressure of 1.0 1k pa and temperature of 295k. when the pressure is changed the volume becomes 500 ml. if there has been no change in temperature what is the new pressure?

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

Sally is making a model of a magnesium atom with an atomic mass number of 24 for her chemistry class. she has foam balls for the protons, neutrons, and electrons. she has added 6 neutrons to her model so far. how many more neutrons does she need to add to complete her neutral atom of magnesium?