CaO +H2O= Ca(OH)2

The initial mass plus the test tube is 10.860g after picking up water to give calcium hydroxide the total mass of the tube and ca(oh)2 is 11.149g
What is the mass of the test tube?

..I did 11.149-10.86=.289 h2o , 40.08/56.08=ca % 16/56.08=o% then I got lost...
Teacher said answer is 9.961g how do I find this?

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