Weathering in action exploration

If 10.g of agno3 is available, what volume of 0.25 m agno3 can be prepared

Can someone me with 6 to 10 plz this is for masteries test.

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?