[2 Marks] What volume is occupied by 23.4 mol hydrogen at a temperature of 317 K and a pressure of 719 mm Hg?

Explanation:

given:

n=23.4mol R=0.0821LatmK^-1mol^-1

T=317K

P=719mmhg

760mmhg=1atm

719mmhg= 719/760

=0.95atm

PV=nRT

V= nRT/P

=23.4mol*0.0821LatmK^-1mol^-1*317K/0.95atm

=578.55L

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?

the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.