Because they are the means by which energy needed for photosynthesis is transported into the plant in form of light ernegy
I believe the answer is B
Solutions of acids and bases are good conductors of electricity because they are capable carrying current. Solutions of such substances have ions in the solution which can carry current through out the solution. Hope this answers the question.
Answer:
11.1g
Explanation:
Given parameters:
Mass of water = 100g
Unknown:
Mass of hydrogen gas = ?
Solution:
We need to write the balanced reaction equation first and solve from the known to the unknown;
2H₂O → 2H₂ + O₂
Now, find the number of moles of the given specie;
Number of moles of H₂O = ![\frac{mass}{molar mass}](https://tex.z-dn.net/?f=%5Cfrac%7Bmass%7D%7Bmolar%20mass%7D)
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles =
= 5.56mol
2 mole of water produced 2 mole of hydrogen gas;
5.56 mole of water will produce 5.56 mole of hydrogen gas
Mass of hydrogen gas = number of moles x molar mass
molar mass = 2(1) = 2g/mol
Mass of hydrogen gas = 2(5.56) = 11.1g
The balanced equation for the reaction is as follows
2Na + Cl₂ --> 2NaCl
first we need to find the limiting reactant from the 2 reactants in the reaction
stoichiometry of Na to Cl₂ is 2:1
number of Na moles - 133.0 g / 23 g/mol = 5.783 mol
at STP, molar volume is where 1 mol of any gas occupies a volume of 22.4 L
if 22.4 L occupied by 1 mol
then 33.0 L is occupied by 33.0 L / 22.4 L/mol = 1.47 mol
therefore number of Cl₂ moles present - 1.47 mol
If Cl₂ is the limiting reactant
1 mol of Cl₂ reacts with 2 mol of NaCl
therefore 1.47 mol of Cl₂ reacts with - 2 x 1.47 = 2.94 mol of Na
but 5.783 mol of Na is present which means Na is in excess and Cl₂ is the limiting reactant
NaCl formed depends on amount of Cl₂ present
stoichiometry of Cl₂ to NaCl is 1:2
number of NaCl moles formed - 2 x 1.47 mol = 2.94 mol of NaCl
mass of NaCl formed - 2.94 mol x 58.5 g/mol = 172 g
172 g of NaCl is formed