Physical Science A Semester Exam 7 of 337 of 33 Items Question Under certain conditions, water can be separated into oxygen and hydrogen gases according to the equation 2H2O → 2H2 + O2. In a lab, 112g of hydrogen gas and 888g of oxygen gas were collected. Student A says that the amount of water to start cannot be determined, but Student B says that the water must have been 1000g. Who is correct? (1 point) Responses Student A, because the water was not measured to start with. Student A, because the water was not measured to start with. Neither are correct. It would have been 1112g, because there are 2 H2 to 1 O2. Neither are correct. It would have been 1112g, because there are 2 H 2 to 1 O 2 . Student B, because of the law of conservation of matter. Student B, because of the law of conservation of matter. Neither are correct. It was 2000g because the equation shows 2H2O. Neither are correct. It was 2000g because the equation shows 2H 2 O. Skip to navigation page 1 of 1
Student A is correct. The amount of water to start cannot be determined based on the information given. The equation shows the ratio of 2H2O to 2H2 + O2, but it does not provide information about the actual amount of water used.
