You are leaving for a party at your cousin’s house in a city that is 150 km away. you will travel at an average rate of 50 km/hr. how long will it take you to arrive?

Answer : It take time to arrive will be 3 hours.

Explanation :

Average rate : It is defined as the ratio total distance to total time.

Formula used :

As per question,

Total distance traveled = 150 km

Average rate = 50 km/hr

Now put all the given values in the above formula, we get:

Therefore, it take time to arrive will be 3 hours.

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂