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3 years ago

Why doesnt iron burst into flames when it rusts

1 answer:

3 0

Rust does not have the properties to catch onto flames. However, if you light it on fire, then it would probably catch in flames but not instantly and will not continue to burn unless you have soaked it in oil or flammable object or substance. :) Hope this helps!

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(Atomic masses used are C = 12.0 g mol–1, O = 16.0 g mol–1, H = 1.01 g mol–1, Cu = 63.5 g mol–1,)

alex41 [277]

Question 1

The formula mass of methanol is $12.0+3(1.01)+16.0+1.01=32.04$ g/mol.

Therefore, in 5.0 grams of methanol, there are $5.0/32.04=\boxed{0.16}$ moles.

Question 2

The formula mass of copper(II) carbonate is $63.5+12.0+3(16.0)=123.5$ g/mol.

This means that in 9.0 grams of copper(II) carbonate, there are $9.0/123.5=0.072874493927126$ moles.

Using Avogradro's number, there are $(0.072874493927126)(6.022 \times 10^{23})=\boxed{4.4 \times 10^{22}}$ molecules.

Question 3

The formula mass of cyclohexane is $12.0(6)+1.01(12)=84.12$ g/mol.

So, 3.0 grams of cyclohexane is the same as $3.0/84.12=\boxed{0.036}$ moles.

Question 4

The formula mass of benzene is $12.0(6)+1.01(6)=78.06$ g/mol.

This means that 4.00 moles of benzene has a mass of $(78.06)(4.00)=\boxed{312}$ grams.

Question 5

1000 atoms of calcium is the same as $\frac{1.000}{6.022 \times 10^{23}}$ moles.

This is equal to $\frac{1000}{6.022 \times 10^{23}} \cdot 40.078=\boxed{6.7 \times 10^{-20}}$ grams.

6 0

1 year ago

What is the most appropriate way to present the data below?

Arada [10]

Answer:

I think bar graph is the appropriate way to present the data.

4 0

3 years ago

Read 3 more answers

I WILL GIVE BRAINLIEST!!!!!

Alexxx [7]

HNO₃ + H₂S → S + NO + H₂O

Assign Oxidation Number:

L.H.S R.H.S
N in HNO₃ = +5 +2 = N in NO
S in H₂S = -2 0 = S in S

Write Half cell Reactions:
Reduction Reaction:
3e⁻ + HNO₃ → NO -------(1)
Oxidation Reaction:
H₂S → S + 2e⁻ -------(2)

Multiply eq. 1 with 2 and eq. 2 with 3 to balance electrons.

6e⁻ + 2 HNO₃ → 2 NO

3 H₂S → 3 S + 6e⁻
Cancel e⁻s,
______________________________

2 HNO₃ + 3 H₂S → 2 NO + 3 S + H₂O

Balance Oxygen Atoms by multiplying H₂O with 4, Hydrogen atoms will automatically get balance.

2 HNO₃ + 3 H₂S → 2 NO + 3 S + 4H₂O

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3 years ago

What is the most common workplace for people in the Finance cluster?

Romashka [77]

https://www.onetonline.org/find/career?c=6

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3 years ago

Read 2 more answers

ASAP I AM GIVING BRAINLIEST PLEASEEEEEEEEE HELPPPPPPPPPPPPPPPPPP

zepelin [54]

Answer:

Explanation:

In the example, the amount of hydrogen is 202,650 x 0.025 / 293.15 x 8.314472 = 2.078 moles. Use the mass of the hydrogen gas to calculate the gas moles directly; divide the hydrogen weight by its molar mass of 2 g/mole. For example, 250 grams (g) of the hydrogen gas corresponds to 250 g / 2 g/mole = 125 moles.

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3 years ago