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miv72 [106K]
3 years ago
9

What mass of oxygen forms from 71.89 g CO2? Use the periodic table to find molar masses. 71.89 g CO2 =  ------ g O2

Chemistry
1 answer:
andre [41]3 years ago
7 0
We use the ratio of the atoms C and O from the chemical formula. We calculate as follows:

71.89 g CO2 ( 1 mol CO2 / 44.01 g CO2 ) (1 mol O2 / 1 mol CO2) (32 g O2 / 1 mol ) = 52.27 g O2

Therefore, 

71.89 g CO2 =  52.27 <span>g O<span>2</span></span>
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Balance this equation. If a coefficient of "1" is required, choose "blank" for that box. C2H6 + O2 → CO2 + H2O
fenix001 [56]
Step 1: Write the unbalanced equation,

                                 C₂H₆  +  O₂    →    CO₂  +  H₂<span>O

There are 2 C at left hand side and 1 carbon at right hand side. So, multiply CO</span>₂ by 2 to balance C atoms at both side. So,

                                 C₂H₆  +  O₂    →   2 CO₂  +  H₂O

Now, count number of H atoms at both sides. There are 6 H atoms at left hand side and 2 at right hand side. Multiply H₂O by 3 to balance H atoms.


                                 C₂H₆  +  O₂    →   2 CO₂  +  3 H₂O

At last, balance O atoms. There are 2 O atoms at left hand side and 3 O atoms at right hand side. Multiply O₂ with 1.5 (i.e. 3/2) to balance O atoms. i.e.

                                 C₂H₆  +  3/2 O₂    →   2 CO₂  +  3 H₂O

Hence, the equation is balanced. If you want to make equation fraction free then multiply all equation with 2. i.e.

                           ( C₂H₆  +  3/2 O₂    →   2 CO₂  +  3 H₂O ) × 2

                                2 C₂H₆  +  3 O₂    →   4 CO₂  +  6 H₂O
5 0
3 years ago
Read 2 more answers
A 25.0-mL sample containing Cu2+ gave an instrument signal of 25.2 units (corrected for a blank). When exactly 0.500 mL of 0.027
irga5000 [103]

Answer:

The molar concentration of Cu²⁺ in the initial solution is 6.964x10⁻⁴ M.

Explanation:

The first step to solving this problem is calculating the number of moles of Cu(NO₃)₂ added to the solution:

C = \frac{n}{V} \\0.0275 = \frac{n}{0.0005} \\

n = 1.375x10⁻⁵ mol

The second step is relating the number of moles to the signal. We know the the n calculated before is equivalent to a signal increase of 19.9 units (45.1-25.2):

1.375x10⁻⁵ mol _________ 19.9 units

        x              _________  25.2 units

x = 1.741x10⁻⁵mol

Finally, we can calculate the Cu²⁺ concentration :

C = 1.741x10⁻⁵mol / 0.025 L

C = 6.964x10⁻⁴ M

7 0
3 years ago
An astronomer observes an asteroid in the solar system. He notes that the asteroid is three times farther from the Sun than Eart
ozzi

Answer:

3 AU

Explanation:

The distance from the Earth to the Sun is known as 1 AU, or 1 Astronomical Unit. If an asteroid is three times this distance, it is 3 AU away.

7 0
3 years ago
A 1 mL pipette delivers a measured volume of .98 mL (calculate the percentage error)
Natalija [7]

Answer:

2%

Explanation:

.98 is 98% of one and therefore they are missing 2%

4 0
3 years ago
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Which statement best describes an igneous intrusion? 
Andrew [12]
D. Magma is injected into surrounding rock forming an igneous intrusion.

Igneous intrusion forms when magma from under the surface of the earth is slowly pushed up to occupy spaces or cracks found among rocks and cools down and solidifies before it reaches the surface of the earth.
4 0
3 years ago
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