Mr(Ca(H₂PO₄)₂)= 40+(1·2 +31+16·4)·2 = 40+194 = 234
Mr(NH₄Br) = 14 +1·4 +80 = 98
странная формула, но все же:
Mr((PF₃)₂O) = (31+19·3)·2 +16 = 88·2+16 = 192
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Mr(Ca(H₂PO₄)₂)= 40+(1·2 +31+16·4)·2 = 40+194 = 234
Mr(NH₄Br) = 14 +1·4 +80 = 98
странная формула, но все же:
Mr((PF₃)₂O) = (31+19·3)·2 +16 = 88·2+16 = 192