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4 years ago

30 POINTS PLEASE TELL ME HOW TO SOLVE THIS!!

Chemistry

2 answers:

Yuki888 [10]4 years ago

6 0

Explanation:

moles = mass in gm/ molar mass =3.4/12= 17/60

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bija089 [108]4 years ago

3 0

Answer:

3 moles of carbon atoms is equivalent to 36 gm carbon.

In 12gm carbon there are 6.023*10^23 atoms.

So in 36 gm there are 3*6.023*10^23 atoms.

so the answer is 18.069*10^23 atoms.

Explanation:

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Which of the following gas samples would have the largest number of representative particles at STP? A. 0.520 L SO3 B. 0.10 L Xe

egoroff_w [7]

Answer: The correct option is D.

Explanation: To calculate the larges number of partivles of gas, we will use Avogadro's Law which says that volume of the gas is directly related to the number of moles of gas at constant pressure and temperature.

Mathematically,

$\frac{V_1}{n_1}=\frac{V_2}{n_2}$ ....(1)

The gas which has the largest number of moles, will have the largest number of particles.

We are provided to use STP conditions, which says that

1 mole of a gas occupies 22.4 L of volume.

Initial conditions:

$n_1=1mole$

$V_1=22.4L$

A. 0.520 L of $SO_3$

$V_2=0.520L$

Putting all the values, in equation 1, we get

$\frac{22.4}{1}=\frac{0.520}{n_2}$

$n_2=0.0232moles$

B. 0.10 L of Xe

$V_2=0.10L$

Putting all the values, in equation 1, we get

$\frac{22.4}{1}=\frac{0.10}{n_2}$

$n_2=0.0044moles$

C. 7.0 L of $N_2$

$V_2=7.0L$

Putting all the values, in equation 1, we get

$\frac{22.4}{1}=\frac{7.0}{n_2}$

$n_2=0.3125moles$

D. 12.0 L of Ne

$V_2=12.0L$

Putting all the values, in equation 1, we get

$\frac{22.4}{1}=\frac{12.0}{n_2}$

$n_2=0.5357moles$

Hence, from the above calculations, we see that option D has the largest amount of moles and hence, will have the largest amount of particles.

6 0

4 years ago

Read 2 more answers

Plz answer question number 1,2,4,5 and 6

yulyashka [42]

Answer:

1.Handpicking,winnowing and sieving 2. distillation 3.distillation 5. winnowing 6.magnet

4 0

4 years ago

I need someone to help me with this. PLEASE, I'M BEGGING YOU

musickatia [10]

Answer:

D. 25%

Explanation:

8 0

3 years ago

Using the balanced equation for the next few questions: 4 Fe(s) + 30 (9) - 2Fe2O3(s)

stira [4]

Answer:

0.075 moles of iron oxide would be produced by complete reaction of 0.15 moles of iron.

Explanation:

The balanced reaction is:

4 Fe + 3 O₂ → 2 Fe₂O₃

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Fe: 4 moles
O₂: 3 moles
Fe₂O₃: 2 moles

You can apply the following rule of three: if by stoichiometry 4 moles of Fe produce 2 moles of Fe₂O₃, 0.15 moles of Fe produce how many moles of Fe₂O₃?

$moles of Fe_{2} O_{3} =\frac{0.15 moles of Fe*2 moles of Fe_{2} O_{3} }{4 moles of Fe}$

moles of Fe₂O₃= 0.075

0.075 moles of iron oxide would be produced by complete reaction of 0.15 moles of iron.

5 0

3 years ago

Just need the bottom two rows completed. Will give brainliest.

rodikova [14]

Explanation:

19/9 F -1 (19 is stacked over 9 next to F) #protons: 9, #neutrons: 10, #electrons: 10

55/26 Fe +3, atomic #: 26, mass #: 55, #protons: 26, #neutrons: 29, #electrons: 23

6 0

3 years ago