Real gases behave most nearly like ideal gases at 1. high temperatures and high pressures. 2. high pressures and low molar masses. 3. low temperatures and high pressures. 4. low temperatures and low pressures. 5. high temperatures and low pressures.

5. high temperatures and low pressures.

Explanation:

Real gases are the gases whose molecules have considerable volume and they occupy large space.

Whereas molecules of ideal gas have negligible volume as compared to the total volume and therefore, they do not occupy any space.

A real gas behave like an ideal gas under the conditions of high temperature and low pressure.

This is because at high temperature and low pressure molecules of gas will have high kinetic energy , and will be far part and weak force of attraction. Thus, real gas will behave like an ideal gas.

the number of protons in the nucleus of a given element. has slight luster and conducts electricity at high temperatures like metal.but like a nonmetal,boron is brittle and does not conduct electricity well at low temperatures. in graphite, carbon is a soft,brittle solid.it is reflective,ductile,or malleable.

as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2