[单选题]50gNaOH溶于水并稀释至250mL,则此溶液的质量浓度是( )。A.200g/LB.250g/LC.100g/LD.50g/LE.25g/L
[单选题]50gNaOH溶于水并稀释至250mL,则此溶液的质量浓度是( )。A.200g/LB.250g/LC.100g/LD.50g/LE.25g/L
[单选题]50gNaOH溶于水并稀释至250mL,则此溶液的质量浓度是( )。A.200g/LB.250g/LC.100g/LD.50g/LE.25g/L
[问答题,计算题] 将20.0gNaOH溶于水并定容至200mL,求此溶液物质的量浓度是多少?PH值又是多少?(NaOH的分子量:40)
[问答题,计算题] 12.5gNaOH溶于50mL水中,求此溶液的质量百分浓度是多少?
[单选题]80gNaOH溶于120g水中,其溶液质量浓度是()。A .33%B .25%C .40%D .50%
[问答题] 计算题:2.5gNaOH溶于50mL水中,求此溶液的质量百分浓度是多少?(水的相对密度等于0.998)
[单选题,A2型题,A1/A2型题] 50gNaNO溶于水并稀释至250ml,则此溶液的质量浓度是()。A . 250g/LB . 50g/LC . 200g/LD . 100g/LE . 25g/L
[单选题,A2型题,A1/A2型题] 50gNaNO溶于水并稀释至250ml,则此溶液的质量浓度是()A .50g/LB .100g/LC .200g/LD .250g/LE .25g/L
[单选题]50gNaNO2溶于水并稀释至250ml,则此溶液的质量浓度是()。A.250g/LB.50g/LC.200g/LD.100g/LE.25g/L