Valence must be considered and whether the substance is an atom or molecule, for example: 2Na + Cl2=>2 NaCl
Answer:
0 %
Explanation:
As we know 10.81 is the average atomic mass of boron which can not be contained by a single boron atom. Therefore, when isolated, a single boron atom will weight either 10 amu for ¹⁰B and 11 amu for ¹¹B respectively.
The average atomic mass is calculated as;
Atomic Mass of ¹⁰B = 10
Atomic Mass of ¹¹B = 11
Natural Abundance of ¹⁰B = 20 %
Natural Abundance of ¹¹B = 80 %
So,
Average Atomic Mass = (10 × 0.2) + (11 × 0.8)
Average Atomic Mass = 2 + 8.8
Average Atomic Mass = 10.8
Answer:
787.5 grams of glucose (C₆H₁₂O₆) can prepare 1750 mL of a 2.50 M solution
Explanation:
Molarity (M) is a concentration measure that indicates the number of moles of solute that are dissolved in a given volume.
Molarity is expressed in the following way:
Molarity is expressed in units .
2.50 M means that in 1 L of solution there are 2.5 moles of glucose. So, you apply a rule of three as follows: if in 1 L there are 2.5 moles of glucose, in 1.75 L (1750 mL, being 1000 mL = 1 L) how many moles of the compound are there?
moles=4.375
Being:
- C: 12 g/mole
- H: 1 g/mole
- O: 16 g/mole
The molar mass of glucose is:
C₆H₁₂O₆= 6* 12 g/mole+ 12* 1 g/mole + 6* 16 g/mole
C₆H₁₂O₆= 180 g/mole
Then you can apply a rule of three as follows, knowing the moles in 1750 mL and the molar mass: if there are 180 g of glucose in 1 mole, how much mass is there in 4.375 moles?
mass= 787.5 g
<u><em>787.5 grams of glucose (C₆H₁₂O₆) can prepare 1750 mL of a 2.50 M solution</em></u>
Answer:
A convex lens bends light rays inward, which results in the object being perceived as larger or closer.
Explanation:
B- Reaction
Hope this helps you!!!!!!