首先，计算莽草酸（C7H10O5）的式量12*7+10+16*5=174C%=12*7/174*100%=48.3%H%=10/174*100%=5.7%O%=1-(48.3%+5.7%)=46.0%
Chemical Formula: C7H10O5Molecular Weight: 174.15Elemental Analysis: C, 48.28%; H, 5.79%; O, 45.94%
