膽礬：CuSO4*5H2O n(CuSO4*5H2O)=12.5/250=0.05mol
n(CuSO4)=0.05mol m(CuSO4)=0.05*160=8g
8/(12.5+x)=0.1
8=1.25+0.1x
6.75=0.1x
x=67.5g
所以需要加水67.5g
10g膽礬含CuSO4 6.4g,混合后溶質(zhì)質(zhì)量分?jǐn)?shù)為6.4/100=6.4%
10gSO3物質(zhì)的量為0.125mol,SO3+H2O==H2SO4 生成硫酸0.125mol,生成硫酸12.25g,混合后溶質(zhì)質(zhì)量分?jǐn)?shù)為12.25/100=12.25%
10g氧化鈣物質(zhì)的量為10/56mol CaO + H2O == Ca(OH)2 生成氫氧化鈣10/56mol,生成氫氧化鈣10/56 * 74g,混合后溶質(zhì)質(zhì)量分?jǐn)?shù)為13.21%
10g氯化鈉,混合后溶質(zhì)質(zhì)量分?jǐn)?shù)為10%
所以選A
加壓降溫后的固體可以作制冷劑的是：CO2