Answer:
Unicellular organisms achieve locomotion using cilia and flagella. By creating currents in the surrounding environment, cilia and flagella can move the cell in one direction or another.
Explanation:
Answer:
See below
Explanation:
370 g / .090 g/l = _____?___ liters
take that answer then :
? liters / 22.4 liters / mole = # moles done!
There are 12 protons and 10 electrons in a <span>Mg2+</span> ion, the normal amount of neutrons is 12<span>.
</span>Explanation:
Magnesium is an element with atomic number 12. This means that every magnesium atom will have 12 protons.
In a magnesium atom, there are 12 electrons, to make the atom have a neutral charge. When an ion is formed, the magnesium atom loses electrons. The <span>2+</span>charge shows that the magnesium ion has two more protons than electrons. The proton number for magnesium does not change, so <span>Mg<span>2+</span></span> must have two less electrons, i.e. 10 electrons.
The number of neutrons varies among different isotopes of magnesium. An isotope of an element means it just has different amounts of neutrons.
The most common isotope of magnesium is <span>24Mg</span>. This 24 indicates the total number of protons and neutrons. Magnesium has 12 protons, so must have
<span>24−12=12 neutrons</span>
Other isotopes of magnesium have different numbers of neutrons, i.e. <span>25Mg</span> has 13neutrons, <span>26Mg</span> has 14 neutrons. <span>24Mg</span> is most likely being referred to in the question, though.
Answer:
Percent yield = 89.1%
Explanation:
Based on the equation:
Cl₂ + 2KI → 2KCl + I₂
<em>1 mole of Cl₂ reacts with 2 moles of KI to produce to moles of KCl</em>
<em />
To solve this quesiton we must find the moles of each reactant in order to find the limiting reactant. With the limiting reactant we can find the moles of KCl and the mass:
<em>Moles Cl₂:</em>
8x10²⁵ molecules * (1mol / 6.022x10²³ molecules) = 133 moles
<em>Moles KI -Molar mass: 166.0028g/mol-</em>
25g * (1mol / 166.0028g) = 0.15 moles
Here, clarely, the KI is the limiting reactant
As 2 moles of KI produce 2 moles of KCl, the moles of KCl produced are 0.15 moles. The theoretical mass is:
0.15 moles * (74.5513g / mol) =
11.2g KCl
Percent yield is: Actual yield (10.0g) / Theoretical yield (11.2g) * 100
<h3>Percent yield = 89.1%</h3>
Answer:
It's 23.14 percent
Explanation:
First, the mass of all the elements are:
N = 14
O = 16
Fe = 56
In this molecule you have 3 atoms of N, and 9 atoms of O, so:
3•14 = 42
16•9 = 144
The whole mass of the molecule is:
56 + 42 + 144 = 242
242/100 = 2.42, so 1% is 2.42
56/2.42 = 23.14%