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4 years ago

How does movement determine what side we see of the moon

1 answer:

8 0

Because we are moving at a constant rate (seeing as we're on earth and the earth is spinning) but the moon does not spin as it revolves around us, therefore we only see the one side of it.

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How many moles of water molecules, h2o, are present in a 27 gram sample of water?

Helga [31]

Molar mass of H2O = 1 x 2 (of 2 H) + 16 (of 1 O)
No. of moles of water = Mass/Molar mass = 27g/(18 g/mol) = 1.5 mol

4 0

4 years ago

Read 2 more answers

At a certain temperature, 0.4011 mol of N 2 and 1.501 mol of H 2 are placed in a 3.00 L container. N 2 ( g ) + 3 H 2 ( g ) − ⇀ ↽

kenny6666 [7]

Answer:

Kc = 16.6

Explanation:

Step 1: Data given

Number of moles N2 = 0.4011 moles

Number of moles H2 = 1.501 moles

Volume = 3.00 L

At equilibrium, 0.1801 mol of N 2 is present

Step 2: The balanced equation

N2(g) + 3H2(g) ⇆ 2NH3(g)

Step 3: Calculate amount of N2 reacted

moles N2: 0.4011 mol - 0.1801 mol = 0.221 mol

For 1 mol N2 therewill react 3 moles of H2 to produce 2moles of NH3

Moles H2 reacted= 3 * 0.221 mol = 0.663 mol es

Moles NH3 produced = 2 * 0.221 mol = 0.442 mol es

Step 4: Amount of moles at equilibrium

Moles N2 = 0.1801 mol

[N2] = 0.1801 mol / 3.0 L = 0.06003 M

Moles H2 =1.501 moles - 0.663 mol = 0.838 moles

[H2] = 0.838 moles / 3.0 L = 0.2793 M

Moles NH3 = 0.442 mol

[NH3] = 0.442 mol / 3.0 L = 0.1473 M

Step 5: Calculate Kc

Finally, we can calculate Kc:

Kc = [NH3]² / ([N2] [H2]³)

Kc = (0.1473²)/(0.06003 *0.2793³)

Kc = 16.6

5 0

3 years ago

Graphite is a form of____.

tigry1 [53]

Answer:

D. Carbon

Explanation:

Graphite, archaically referred to as plumbago, is a crystalline form of the element carbon with its atoms arranged in a hexagonal structure. You'll get the substance when carbon is stacked in sheets. It occurs naturally in this form and is the most stable form of carbon under standard conditions. Under high pressures and temperatures, it converts to diamond. Graphite is used in pencils and lubricants. It is a good conductor of heat and electricity. Its high conductivity makes it useful in electronic products such as electrodes, batteries, and solar panels.

3 0

3 years ago

If there are 40 mol of NBr3 and 48 mol of NaOH, what is the excess reactant?

Nata [24]

Answer:

The correct answer is option B.

Explanation:

$3NaOH+2NBr_3\rightarrow 3HOBr+3NaBr+N_2$

Moles of $NBr_3$ = 40 mol

Moles of NaOH = 48 mol

According to reaction, 3 moles of NaOH reacts with 2 moles $NBr_3$

Then ,48 moles of NaOH will reacts with:

$\frac{2}{3}\times 48 mol=32 mol$ of $NBr_3$

Then ,40 moles of $NaBr_3$ will reacts with:

$\frac{3}{2}\times 40 mol=60 mol$ of NaOH

As we can see that 48 moles of sodium will completey react with 32 moles of nitrogen tribromide.

Moles left after reaction = 40 mol - 32 mol = 8 mol

Hence, the $NBr_3$ is an excessive reagent.

6 0

3 years ago

Read 2 more answers

How many grams of lithium sulfide must be dissolved in 1600.0 g water to make a 2.0 molal solution?

klasskru [66]

Molality is the number of moles of solutes in 1 kg of solvent.
the molality of solution to be prepared is 2.0 molal.
therefore 2 moles in 1 kg water.
the mass of Li₂S required is - 46 g/mol x 2.0 mol = 92 g
the mass in 1 kg of solvent is - 92 g
Therefore mass of Li₂S required in 1600.0 g is - 92 g/kg x 1.6 kg = 147.2 g

7 0

3 years ago