My Notes Ask Your Teacher 1. ·02.5 points Previous Answers KF711.E058. In ammoni

Question

My Notes Ask Your Teacher 1. ·02.5 points Previous Answers KF711.E058. In ammonia, 14 g of nitrogen combines completely with 3 g of hydrogen. How many grams of hydrogen does it take to combine completely with 98 g of nitrogen? 32 x g My Notes Ask Your Teacher 2. -2.5 points KF7 11.E.071 You exert a force of 28 N on the head of a thumbtack. The head of the thumbtack has a radius of 6 mm. What is the pressure on your thumb? atm 3. -2.5 points KF7 11.E.078 My Notes Ask Your Teacher An ideal gas has the following initial conditions: 490 cm3, P-3 atm, and = 100°C, what is its final temperature if the pressure is reduced to 1 atm and the volume expands to 1000 cm3? oC

Explanation / Answer

1) 14 gm of nitrogen combines with 3 g Hydrogen

98 gm of nitrogen will combine with (3/14)*98=21 gm of hydrogen

2)Force = 28 N

radius of head = 6 mm

Area of head = pi*62=113.1 mm2

pressure = 28/113.1=0.247 N/mm2

c)P1V1/T1 = P2V2/T2

3*490/373=1*1000/T2

T2=253.7 K = -19.26oC

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