When photosynthesis occurs, carbon dioxide is consumed by the plant and oxygen is the by-product of the reaction. Oxygen is vital to survival since we need it to breathe.
Photosynthesis is how plants make food for themselves. We get our food directly (we eat vegetables) and indirectly (herbivorous animals) from plants.
They’re called periods, answer A
Answer:
only 2.5 grams will be present after 16 years have passed
Answer:
Mass = 76.176 g
Explanation:
Given data:
Mass of lead(II) chloride produced = 62.9 g
Mass of lead(II) nitrate used = ?
Solution:
Chemical equation:
Pb(NO₃)₂ + 2HCl → PbCl₂ + 2HNO₃
Number of moles of lead(II) chloride:
Number of moles = mass/molar mass
Number of moles = 62.9 g/ 278.1 g/mol
Number of moles = 0.23 mol
Now we will compare the moles of lead(II) chloride with Pb(NO₃)₂ from balance chemical equation:
PbCl₂ : Pb(NO₃)₂
1 : 1
0.23 : 0.23
Mass of Pb(NO₃)₂:
Mass = number of moles × molar mass
Mass = 0.23 mol × 331.2 g/mol
Mass = 76.176 g
Answer:
see explanation
Explanation:
a. Molar Mass = ∑Atomic Masses = 12C + 22H + 11O = 12(12) + 22(1) + 11(16) = 144 + 22 + 176 = 342 g/mole
b. For 100ml of 0.10M solution => Molarity x Volume (liters) = moles needed x mole weight = grams solute needed for 100ml solution. This can be given by the expression ...
mass solute needed (g) = Molarity needed x Volume needed in liters x mole wt of solute = (0.10M)(0.100L)(342g/mole) = 3.42 grams solute.
mixing => Transfer 3.42 grams of solute (C₁₂H₂₂O₁₁) into mixing container and add solvent (water) up to but not to exceed 100 ml total volume.
c. mass needed for 100ml of 0.50M solution = M·V·f.wt. = (0.50M)(0.100L)(342g/mole) = 1.71 grams solute. => mix as in 'b'.