The answer is (3) HClO3. The percent composition mass of chlorine is equals to the mass of one Cl atom /gram-formula mass of the compound. So after calculation, we can get the right answer.
Answer:
0.0468 g.
Explanation:
- The decay of radioactive elements obeys first-order kinetics.
- For a first-order reaction: k = ln2/(t1/2) = 0.693/(t1/2).
Where, k is the rate constant of the reaction.
t1/2 is the half-life time of the reaction (t1/2 = 1620 years).
∴ k = ln2/(t1/2) = 0.693/(1620 years) = 4.28 x 10⁻⁴ year⁻¹.
- For first-order reaction: <em>kt = lna/(a-x).</em>
where, k is the rate constant of the reaction (k = 4.28 x 10⁻⁴ year⁻¹).
t is the time of the reaction (t = t1/2 x 8 = 1620 years x 8 = 12960 year).
a is the initial concentration (a = 12.0 g).
(a-x) is the remaining concentration.
∴ kt = lna/(a-x)
(4.28 x 10⁻⁴ year⁻¹)(12960 year) = ln(12)/(a-x).
5.54688 = ln(12)/(a-x).
Taking e for the both sides:
256.34 = (12)/(a-x).
<em>∴ (a-x) = 12/256.34 = 0.0468 g.</em>
Answer:
vertebrate and invertebrates
Explanation:
All Vertebrates have a skeletal structure with a spinal backbone and well developed internal skeleton made up of bones and cartilage while Invertebrates have no backbone.
Vertebrate include fish, amphibians, reptiles, birds and mammals. Invertebrates include worms and jellyfish, spiders and crabs.
<u>common characteristics among vertebrates and invertebrates </u>
○ multi-cellular.
○ heterotrophs (cannot make their own food) and must get their energy by consuming plants or other animals.
○ obtain food and oxygen for energy,
The answer would be the second answer: the property that gives it mass. This is because energy is t<span>he property of an object or system that enables it to do work. </span>
Answer:
Lithium (Li)
Explanation:
Lithium has an atomic number of 3
