An object has a mass of 20 g and a volume of 5cm3 what is the objects density

Balance this equation co2(g) + h2o (g) show that the balanced equation obeys the law if conversation of mass

How do i complete this electrolysis of water lab? i’m at home, so i don’t have the materials, and the lab didn’t properly work and was incomplete at school.

A5.000 g sample of niso4 h2o decomposed to give 2.755 g of anhydrous niso4. what is the formula of the hydrate? what is the full chemical name for the hydrate? what is the molar mass of the hydrate? niso4•_h2o what is the mass % of water in the hydrate?