Answer:
4.4 g
Explanation:
Step 1: Write the balanced equation
Cu + 4 HNO₃ ⇒ Cu(NO₃)₂ + 2 NO₂ + 2 H₂O
Step 2: Calculate the moles corresponding to 3.2 L of NO₂ at STP
At standard temperature and pressure, 1 mole of NO₂ occupies 22.4 L.
3.2 L × 1 mol/22.4 L = 0.14 mol
Step 3: Calculate the moles of Cu needed to produce 0.14 moles of NO₂
The molar ratio of Cu to NO₂ is 1:2. The moles of Cu needed are 1/2 × 0.14 mol = 0.070 mol.
Step 4: Calculate the mass corresponding to 0.070 moles of Cu
The molar mass of Cu is 63.55 g/mol.
0.070 mol × 63.55 g/mol = 4.4 g
Answer:
C) Organic Weathering
Explanation:
Heat and Cold
And if some people start reporting and making fun of me in this answer don't listen to them.
They are hunting me down.
<span>Answer:
The two basic steps to determine whether a molecule is polar are:
</span>
<span><span>1) determine whether the molecule contains polar bonds?
</span>
2) determine whether the polar bonds add together to
form a net dipole moment.
Explanation:
The fundamental requirement is that there are polar bonds. Polar bonds are covalent bods with dipole moments. Dipole moments are the result of two atoms of different electronegativity sharing electrons. The more electroneative atom pulls the electrons with more strength than the other atom which is what generate the dipole moment.
If the molecule is symmetrical, and the dipole moments are place symmetrically they wil cancel each other and the molecule will not be polar. For example, the molecule of CCl4 has four C - Cl bonds each with dipole moment, but they are loacates symmetrically around the C atom, so they will cancel each other resulting in a zero net sum of dipole moments, being the molecule non-polar.
</span>
The molarity of the solution is calculated by dividing the number of moles of the solute, in moles, by the total volume of the solution, in liters.
The molar mass of calcium hydroxide, Ca(OH)2 is calculated below.
m = molar mass Ca + 2(molar mass O) + 2(molar mass H)
Substituting,
m = 40 g/mol + 2(16 g/mol) + 2(1 g/mol)
m = 74 g/mol
To get the number of moles Ca(OH)2 in 75.8 grams,
n = (75.8 grams)(1 / 74 g/mol) = 1.024 moles
The molarity, M, is therefore,
M = (1.024 moles Ca(OH)2) / (1.2 L)
M = 0.854 M
<em>Answer: 0.854 M</em>
