PLEASE HELP༼ つ ◕◡◕ ༽つ How does this evidence proves that the law of conservation of mass is presented in the mixing of baking soda and vinegar in a closed system?

At element makes up all organic compounds?

In science class richard learns that a substance has a boiling point of 230 fahrenheit his teacher ask him to convert this temperature to degrees celsius what is the boiling point of his substance in degrees celsius

In an experiment, 45g of silicon tetrachloride are treated with 45ml of water. what is the theoretical yield in grams of hcl