Why would countries replace paper cash with polymer cash?

The density of an unknown gas at 98°c and 740 mmhg is 2.50 g/l. what is the molar mass of the gas with work showed?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)