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oops sorry....3.63g of nitrogen gas

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when 20mL of 2M of N2O5 was heated 0.28L of O2 at NTP was formed after 30 minutes.Calculate the concentration of unreacted N2O5  at that time and also find the average rate of reaction??

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Inject simultaneously 0.68 g of oxygen gas and 3.63 g into a 5 litre box at 127 degree celsius.What is the final pressure in mm Hg??(R=0.082 litre atm/degree/mol)

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Gaseous benzene reacts with hydrogen gas in the presence of Ni catalyst to form gaseous cyclohexane as per the following reaction:

C6H6(g) + 3H2(g) = C6H12(g)

A mixture of benzene and excess of hydrogen has a pressure of 70mm Hg.The pressure of cyclohexane formed is 35 mm Hg in the same volume and temparature.Calculate the fraction of benzene by volume in the original volume???

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a jet of water with cross sectional area 'a' is striking against a wall at an angle theta with normal and rebounds elastically.If the velocity of water jet is 'v' and density is 'd' the normal force on wall is:

1) 2a(v^2)d cos theta

2) 2avd cos theta

3) a(v^2)d cos theta

4) avd cos theta

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A uniform rope of mass M,length L is fixed at its upper end vertically from a rigid support.Then the tension in the rope at the distance l from the rigid support:

1) Mg(L/(L+l))

2) (Mg/L)*(L-l)

3) Mg

4) (l/L)*Mg

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pls b a little more clear............

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Momentum can be described as the quantity of motion of a body.It is the product of the mass and velocity of body.

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Two blocks of equal mass m are tied to each other through a light string.One of the blocks is pulled along the line joining them with a constant force F.Find tension in string joining the block....pls explain

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mg is suspended from the middle of the rope whose ends are at the same level.The strings are no longer horizontal so the minimum tension required to straighten it is:

1) mg/2

2)ms cos theta

3) 2 mg cos theta

4) infinetly large

pls explain..............

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constant mass of rocket=5700 kg

constant rate of gas ejection=15 kg/s

constant speed=12 km/s

accelaratin of rocket 1 min. after blast will be:

1)34.9 m/(s^)

2)27.5 m/(s^)

3)3.50 m/(s^)

4)13.5 m/(s^)

pls explain............

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A projectile is fired with u m/s velocity at an angle theta with the horizontal. At hmax the projectile splits into m , m , 2m .first m falls vertically down and second follows the same path to the point of projection.Therefore v of 2m:

1) u cos theta

2) 3/2 u cos theta

3) 2u cos theta

4)  5/2 u cos theta

pls explain........

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If 0.200 g of H2 (diatomic hydrogen gas) is needed to inflate a balloon to a certain size at 20 degree celsius what mass is needed to inflate it to the same size at 30 degree celsius??

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An open vessel at 27 degree celsius is heated until three fifth of the air has been expelled out.assuming volume to be constant find the temparature to which the vessel has been heated???

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Pay load is defined as the diffrence between the mass of the displaced air and the mass of the balloon.Calculate the pay load when a balloon of radius 10m , mass 100 kg is filled with helium at 1.66 bar at 27degree celsius .(density of air=1.2kg/m3 and R=0.083 dm3/K/mol)???

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parenchyma is a type of mechanical tissue which provides support and rigidity to the body of the organism

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A spore is used in asexual reproduction and gametes are mainly used in sexual reproduction. Spores in fungi are of 3 types-zoospores,aplanospores and conidia whereas gametes are formed in fungi by meiosis and go through gametangial copulation,somatogamy and many other types of sexual reproduction.

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please tell me when is accelaration due to gravity -ve and when is it +ve??pls explain

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Given that for a projectile the time is 't'. y=5t-8(t^2)  and   x=12t.So the velocity is:

1)5m/s

2)12m/s

3)13m/s

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The current 'i' in a circuit containing inductor 'L' , resistor 'R' , varies accordingly with time 't' as:

iR + L(di/dt) = (i0) R

where (i0) is the maximum current .

Find an expression for current given at t=0,i=0

iR + L(di/dt) = (i0) R

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