There is too much rain. /There are so much orange juice that I can't consume it at a time.

There is too much rain. /There are so much orange juice that I can't consume it at a time.
上面两句much同样修饰不可数名词rain和orange juice,为什么前一句用there is,而后一句用there are,难道是句子本身错了,如果是,请问哪一个错了?