100 gram of KNO3 heated to redness. Find volume of oxygen is liberated at 39°C and 765 torr pressure.
Answers
2KNO3 ----. 2KNO2 + O2 - this balanced equation tells you that 2 moles of the nitrate makes 2 moles of nitrite and 1 mole of O2
The nitrate molar mass = K + N +(3xO) = 39 +14 +(3x16) =
101 g/mole. the molar mass of O2 is 32 g
the equation say then that 2(101)g of nitrate will make 32 g O2 or 202 g will make 32 g O2
If you start with 5 g KNO3, the amount of O2 you can make will be 5 X 32/202 = 0.792 grams O2
Check: 32/202 = 0.15841; 5 X 0.15841 = 0.792 g. The volume of O2 you collect will depend on how you collect it and upon temperature and pressure.
probably around 550 ml - but cannot be exact without more information
Answer:
2KNO3 ----. 2KNO2 + O2 - this balanced equation tells you that 2 moles of the nitrate makes 2 moles of nitrite and 1 mole of O2
The nitrate molar mass = K + N +(3xO) = 39 +14 +(3x16) =
101 g/mole. the molar mass of O2 is 32 g
the equation say then that 2(101)g of nitrate will make 32 g O2 or 202 g will make 32 g O2
If you start with 5 g KNO3, the amount of O2 you can make will be 5 X 32/202 = 0.792 grams O2
Check: 32/202 = 0.15841; 5 X 0.15841 = 0.792 g. The volume of O2 you collect will depend on how you collect it and upon temperature and pressure.
probably around 550 ml - but cannot be exact without more information