I) Calculate the volume of hydrogen gas
produced at s. t.p., when 30g of zinc is
added to excess dilute hydrochloric acid
at 33°C and 775 mmHg pressure.
H = 1, Zn = 65, Cl = 35.5) molar volume
of a gas at s. t.p. = 22.4 dm').

What is the molarity of a solution that is prepared by adding 57.1 g of toluene (c 7 h 8 ) (density = 0.867 g/ml) to a 250 ml volumetric flask, and then filling to the mark with benzene (c 6 h 6 ) (density = 0.876 g/ml)?

Atrain travels 74 kilometers in 3 hours, and then 81 kilometers in 5 hours. what is its average speed?

Answer asap need it by wednesday morning calculate the ph of 0.02m hcl best answer will be brainliest