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3 years ago

I need urgent help grade at risk with my chemistry homework!! Please i beg anyone the image is posted and show work if you can

Chemistry

2 answers:

saul85 [17]3 years ago

5 0

Answer:

im only answering because the other person deserves brainliest

xplanation:

Charra [1.4K]3 years ago

4 0

Hey! so I can help you with the beginning!

1. The ratio of Fe to O2 is 4:3 so since they tell you that you have 56 moles of Fe, all you have to do is plug in the information. So 56/4 = 14 and 3 x 14 = 42. To conclude, the answer for number one is 42 moles of O2.

2.Same thing from #1 except the ratio is 4:2 (since we are now talking about Fe2O3) so you divide 56/4 and get 14 so you multipy 2x 14 which gives you 28. To conclude, the answr to numbner 2 is 28 moles of Fe2O3.

3. On this question it is asking for grams, not moles, so we have to look on our periodic table and look for the atomic mass of Fe. To start off the problem you are going to have to find the amount of moles of Fe needed to react with 27 moles of O2 so the ratio will be 4:3 so you need to divide 27/3 which gives you 9. Multiply 9x4 and that gives you 36 moles. DONT FORGET TO CONVERT TO GRAMS. The final answer will be 2,010.42 g of Fe after you multiply 36 x 55.845 g (Fe atomic weight.

I would help you more but I have school tomorrow as well... I help this helped though.

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Which statement is true about crystal lattice energy

Arturiano [62]

Hey there!:

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3 0

3 years ago

Read 2 more answers

Calculate the volume occupied by 272g

cupoosta [38]

The answer for the following problem is mentioned below.

Therefore volume occupied by methane gas is 184.78 × 10^-3 liters

Explanation:

Given:

mass of methane( $CH_{4}$ ) = 272 grams

pressure (P) = 250 k Pa =250×10^3 Pa

temperature(t) = 54°C =54 + 273 = 327 K

Also given:

R = 8.31JK-1 mol-1 ,

Molar mass of methane( $CH_{4}$ ) = 16.0 grams

We know;

According to the ideal gas equation,

P × V = n × R × T

here,

n = m÷M

n =272 ÷ 16

n = 17 moles

Therefore,

250×10^3 × V = 17 × 8.31 × 327

V = ( 17 × 8.31 × 327 ) ÷ ( 250×10^3 )

V = 184.78 × 10^-3 liters

Therefore volume occupied by methane gas is 184.78 × 10^-3 liters

6 0

3 years ago

Complete the following sentences with the protagonist’s name and adjectives to describe him or her at each stage of the plot. Us

djverab [1.8K]

Answer:

Explanation:

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2 years ago

2.0 L of a gas is at STP. What is the new pressure in kPa if the volume changes to 10.5 L and the temperature and # of molecules

Alexandra [31]

Answer:

What is the new volume if the temperature is constant? V=2.50L. P = lookPa. P2=40k Pa. V2 = x. PV = P2 ... If a sample of gas occupies 6.8 L at 327°C

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3 years ago

16. Which element has th17. Magnesium, Mg, tends to form a +2 ion. Which will have the larger atomic radius? Mg or Mg2+ (Explain

SashulF [63]

Answer:

Th is the symbol for element Thorium.

Mg is magnesium while Mg 2+ is magnesium Ion. Judging from periodic trends, atomic radius is one half the distance between the atoms of two covalently bonded atoms. It decreases as elevtrons are added to valence shells. That means, across the period it increases and down the group it decreases. Making Mg2+ smaller.

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Explanation:

6 0

3 years ago