What is the to things that have panes of glass

Which of the following is an igneous rock?

Jenny takes a piece of paper and dipped it in a bowl of water the paper is now damp and mushy which of the following is our true about the change that occurs when the paper gets wet

So, if a sample of a compound decomposed to its constituent elements and produced 25.6 g of o, and 9.60 g of carbon, and another sample produced 21.6 g of o, how much carbon was produced in the second sample?