Calculate the volume of "dry" hydrogen that would be produced by one mole of magnesium at standard temperature and pressure.
Mg+2HCl=MgCl2+H2

The volume of H2 = 243mL = 0.243 L

Pressure of H2 gas collected = 745 mm

Pressure of H2 dry gas = P of H2 collected - vapor pressure of water = 745- 23.78 = 721.22 mm

= 721.22mm /760mm/atm

Temperature = 25C = 25+273= 298 K

Using the ideal gas equation

PV = nRT

or PV = (mass/molar mass) RT

(721.22/760)atm x 0.243L = (mass/ 2g/mol) x 0.0821L.atm/mol.K x 298K

Thus mass of H2 formed = 0.0188 g

Explanation:

the leaf is an organ of a typical plant, and the main functions are to complete photosynthesis and allow the plant to exchange gas, just like how we have the respiratory system. leaves have the stomata, which collects maintains co2 and o2 levels. this is necessary for cell metabolism. the leaf also collects sunlight using chloroplasts. succinctly, leaves own a pivotal role in sustaining plant life.

explanation:

i think option no d is the correct answer