the following reaction is used to generate hydrogen gas in the laboratory. if 243 ml of gas is collected over water at 25°c and has a total pressure of 745 mm hg, what mass of hydrogen is produced?

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Complete the following statements to describe solids, liquids, and gases. select the correct answer from each drop-down menu. a solid a definite volume and a definite shape. a liquid a definite volume and a definite shape. a gas a definite volume and a definite shape

An unknown insoluble substance displaced the water shown. it's mass is indicated on the triple beam balance. mass = a. 694 b. 693.5 c. 693.0 d.693.8