a)mCaO=40u+16u=56umCa : mO = 40 : 16mCa : mO = 5 : 2
b) mMgBr₂=24u+160u=184umMg : mBr = 24 : 160mMg : mBr = 3 : 20
c) mCr₂S₃=104u+96u=200umCr : mS = 104 : 96mCr : mS = 13 : 12
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a)mCaO=40u+16u=56u
mCa : mO = 40 : 16
mCa : mO = 5 : 2
b) mMgBr₂=24u+160u=184u
mMg : mBr = 24 : 160
mMg : mBr = 3 : 20
c) mCr₂S₃=104u+96u=200u
mCr : mS = 104 : 96
mCr : mS = 13 : 12