Urgent! Ty! A saturated solution of potassium chloride is made at 90 °C. If the temperature is rapidly cooled to 30°C, how much potassium chloride precipitates?​

What is the density of the black hole

Which statement describes evidence of a chemical reaction? a) ice melting eliminate b) water boiling c) lighting a match d) grape juice freezing

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 ?