将0.08mol的MN(N的相对分子质量大于M)两种饱和一元醇
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(1)当V1=160mL时,此时,溶液是MgSO4、Al2(SO4)3和Na2SO4混合液,由Na+离子守恒可知,n(Na2SO4)=12n(NaOH)=12×0.16L×1mol/L=0.08mol
由于:mn/(m+n)=2则有:mn=2(m+n)则:原式=(3m+3n-5mn)/(-m-n+3mn)=[3(m+n)-5mn]/[-(m+n)+3mn]=[3(m+n)-10(m
(2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)先去括号=2mn+2m+3n-3mn-2n+2m-m-4n-mn合并同类项=-2mn+3m-3n=-2mn+3(m-n)把m-n=2,
同学,你题目应该是写错了应该是这样的吧mxm+mn+m=14nxn+mn+n=28两列相加,得mxm+nxn+2mn+m+n=42得(m+n)(m+n)+m+n=42得m+n=6或m+n=-7
解(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=-2mn+2m+3n-3mn-2n+2m-m-4n-mn=-2mn-3mn-mn+2m+2m-m+3n-2n-4n=-6mn+3
m=n:恰好完全反应,醋酸钠水溶液呈碱性;所以,中性一定就是酸过量一些,m>n.
(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=-2mn+2m+3n-3mn-2n+2m-m-4n-mn=(-2mn-3mn-mn)+(2m+2m-m)+(3n-2n-4n)=-
因为m-mn=21,mn-n=15,所以:m-n=(m-mn)+(mn-n)=21+15=36m-2mn+n=(m-mn)-(mn-n)=21-15=6希望能都帮到你,追问:对不起啊.我把题发错了,m
-MN(M^2N^5-MN^3-N)=-(-6)^3+(-6)^2-(-6)=258
-2mn+2m+3n-3mn-2n+2m-4n-m-mn=-6mn+3m-3n=-6mn+3(m-n)=6+9=15
根据题意绝对值和完全平方非负所以mn-1=0m-n-2=0mn=1m-n=2(-2mn+2m+3n)-(3mn+2n-2m)-(m+4n+mn)=-2mn+2m+3n-3mn-2n+2m-m-4n-m
mn(m-n)-(n-m)=mn(m-n)+(m-n)=(mn+1)(m-n)
原式=-2mn+2m+3n-3mn-2n+2n-m-4n-mn=-6mn+m-n=-6×2+4=-8
提取一个(m-n)原式=(m-n)[mn-m(m-n)],再将m提取出来=m(m-n)[n-(m-n)]
m²n-mn²=mn(m-n)
=(m^2-mn)+2(m^2-n^2)=(m^2-mn)+2(m^2-mn)+2(mn-n^2)题目条件打错了,自己代入一下
20*0.05*n=15*0.1*2,n=3.是一种3价金属离子.
用原子守恒做.mmolC2H2和nmolH2共含有碳原子物质的量=2mmol,含有氢原子物质的量=2m+2nmol燃烧后生成2mmolCO2和(m+n)molH2O所以需要O2物质的量=2m+(m+n
将分式m的2次方+2mn分之n,2n的2次方-mn分之m,m的2次方-4n的2次方分之mn通分后的结果n/(m^2+2mn)=n^2(m-2n)/[mn(m+2n)(m-2n)]m/(2n^2-mn)
n/(m²+2mn)=n/[m(m+2n)]m/(2n²-mn)=-m/[n(m+2n)]2mn/(m²-4n²)=2mn/[(m+2n)(m-2n)]所以n/