Answer:
27.38 g
Explanation:
- CH₃NO₂ (l) + 3O₂ (g) → 4CO₂ (g) + 6H₂O (l) + 2N₂ (g) ΔHorxn = -2836 kJ
The value of ΔHorxn tells us that when 1 mol of CH₃NO₂ is burned, 2836 kJ of heat are produced. With that in mind we can<u> calculate how many moles of CH₃NO₂ were burned when 1273 kJ of heat were produced</u>:
- 1273 kJ * 1mol / 2836 kJ = 0.4489 mol
Then we <u>convert 0.4489 moles of CH₃NO₂ to grams</u>, using its <em>molar mass</em>:
- 0.4489 mol * 61 g/mol = 27.38 g
Answer:
3.94
Explanation:
(3.76 + 3.98 + 4.09)/3 = 3.943333333333333...
3.9 because when you use scientific notation you move your . Space
Answer:
236.8 g
Explanation:
From the reaction equation;
CaC2 + 2H2O(I) --------> C2H2(g) + Ca(OH)2(aq)
Since;
1 mole of CaC2 yields 1 mole of Ca(OH)2
It follows that 3.20 moles of CaC2 also yields 3.2 moles of Ca(OH)2
Mass of Ca(OH)2 = number of moles * molar mass
molar mass of Ca(OH)2 = 74 g/mol
Mass of Ca(OH)2 = 3.20 moles * 74 g/mol =
Mass of Ca(OH)2 = 236.8 g