Chloroplasts.
Always present in almost all plants because they are vital to the process of photosynthesis and primary food production. Onions are not primary producers and do not produce their own food and hence do not require this organelle!
Hope that helps!
<span>The NaCl is extracted three times to get maximum amount of it. Each extraction only yeilds about 50% of the NaCl from the water. So, after the tird extraction, you would have recieved around 87.5% of the total amount of NaCl from the water(50%+25%+12.5%). After the third extraction, the amount of salt in the water will only be a small amount.</span>
Answer:
0.085 moles of N₂O₅ are needed
Explanation:
Given data:
Mass of NO₂ produces = 7.90 g
Moles of N₂O₅ needed = ?
Solution:
2N₂O₅ → 4NO₂ + O₂
Number of moles of NO₂ produced :
Number of moles = mass/ molar mass
Number of moles = 7.90 g/ 46 g/mol
Number of moles = 0.17 mol
now we will compare the moles of NO₂ with N₂O₅.
NO₂ : N₂O₅
4 : 2
0.17 : 2/4×0.17 = 0.085 mol
Thus, 0.085 moles of N₂O₅ are needed.
Answer:
Q = 8.68 × 10⁴ J
Explanation:
We can calculate the heat required to melt a mass of ice, that is, to change it from the solid phase to the liquid phase, at a constant temperature of 0 °C, using the following expression.
Q = ΔH°f × m
where,
- ΔH°f is the standard enthalpy of fusion (ΔH°f for water: 334 J/g)
Q = ΔH°f × m
Q = 334 J/g × 260 g
Q = 8.68 × 10⁴ J