i attempted 4 and 5 im not sure if i solved it right?

4. A student attempted to identify an unknown compound by the method used in this experiment. She found that when she heated a sample weighing 0.5032g the mass dropped to 0.2663g. When the product was converted to a chloride, the mass increased to 0.3747g. a. Is the sample a carbonate? Explain your reasoning. No. because due to mass change upon heating sample rru: 0.50329 be a nydrogen carbonate. 0.261639 b. Based on the ratio of the starting mass to the final mass. what is the formula of the student's unknown compound? 5. The student analyzed a differeat unknown. She found that when she heated a sample weighing 0.5542g the mass dropped to 0.5377g. When the product was converted to a chloride, the mass increased to 0.5933g a. Is the sample a carbonate? Explain your reasoning. Yes No (circle one) a+a: Yes, because the-mass change was slignt change. 0.5542 0.5.377 b. Hlased on the ratio of the starting mass to the final mass, what is the formula of the student's unknowr cornpound? Rat100.593390.5542g=93+0.9742Nacos3