Phosphine gas, PH3, is toxic at exposures greater than 7.0 x 10 mg/L. To what pressure does this correspond at 25°C?

What happens when an acid dissolves?

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?

Sum of brother and sisters age is 26. four times the brothers age is subtracted from three times the sisters age, the difference is 8. what are the ages of the brother and sister?