If the temperature of a gas changes but the number of moles and volumes remain which is the values must also change ?

Correct option is

C

increases by 25%

Ideal gas equation states that: PV=nRT

As temperature remains constant, so PV= constant =k

As pressure decreases by 20% so P

2

=0.8P

⇒PV=(0.8P)V

2

⇒V

2

=

0.8P

PV

=

0.8

V

=1.25V

So volume of gas increases by 25%.

I don’t know

Explanation:

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

d

explanation: