A student investigates how the concentration of an acid affects the speed of the reaction with a 0.5g mass of magnesium at 30°C. the student has a beaker, concentrated acid, water and the apparatus below:
P. a balance
Q. a clock
R. a measuring cylinder
S. a thermometer

which pieces of apparatus does the student use?

A. P, Q & R only
B. P, Q & S only
C. ​

Asteam is contained in a rigid tank with a volume of 1 m3. initially, the pressure and temperature are 7 bar and 500 oc, respectively. the temperature drops due to cooling process. determine: (1) the temperature at which condensation begins in °c, (2) the fraction of the total mass that has condensed when the pressure decreased to 0.5 bar. (3) the volume in m3 occupied by saturated liquid at the final state?