Find the mass of na2co3 needed to give 22.4dm³ of ca2 stp in this reaction
na2co3+> 2nacl+co2+h2o
(na=23, o=16, c=12,molar volume or a gas at stp= 22.4dm³

Which is an accurate description of the physical characteristics of poland? its fertile soil is found only along riverbanks, and its mountainous region in the northwest has few mineral resources. it is mostly flat with fertile soil except in the east and northeast, and the mountainous region in the south has large deposits of coal and copper. it is covered with thick forests, and it has large reserves of coal, petroleum, and natural gas. its landscape is dominated by plateaus, mountains, and high ridges, and it has large deposits of sulfur and copper in the northeast.