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ozzi
3 years ago
6

The cells of plant and animals lack nuclei

Chemistry
1 answer:
Masteriza [31]3 years ago
6 0
That is not true 
They both have nuclei or we would not be living now
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In the metric system of units (S.I), the basic unit of length is ___?
myrzilka [38]

Answer:

meters

Explanation:

6 0
2 years ago
What is the correct measure of density
Darya [45]
Dividing the mass by the volume.
4 0
3 years ago
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The following thermochemical equation is for the reaction of methane(g) with water(g) to form hydrogen(g) and carbon monoxide(g)
Andrei [34K]

Answer:

54.075KJ

Explanation:

Since methane is the limiting reactant.

From the reaction equation,

16 g of methane absorbs 206 KJ of energy

4.20 g of methane will absorb 4.20 × 206/16 = 54.075KJ of energy was absorbed.

From the equation, the value of the enthalpy of reaction is positive, this means that energy is absorbed in the reaction of methane and water. Hence the answer.

6 0
3 years ago
A 9.000L tank at 27.0°C is filled with 5.29g of sulfur tetrafluoride gas and 15.6g of carbon dioxide gas. You can assume both ga
Colt1911 [192]

Answer:

Mole fraction SF₄: 0,121

Mole fraction CO₂: 0,879

Partial pressure SF₄: 0,134 atm

Partial pressure CO₂: 0,968 atm

Total pressure: 1,102 atm

Explanation:

The moles of sulfur tetrafluoride gas and carbon dioxide gas are:

5,29g SF₄×\frac{1mol}{108,07g}= <em>0,0489 moles SF₄</em>

15,6 CO₂×\frac{1mol}{44,01g}= <em>0,354 moles CO₂</em>

Mole fraction SF₄:

X_{SF_{4}} = \frac{0,0489mol}{0,0489+0,354} = <em>0,121</em>

Mole fraction CO₂:

X_{CO_{2}} = \frac{0,354mol}{0,0489+0,354} = <em>0,879</em>

It is possible to obtain partial pressure of both gases with moles of each gas using:

P = nRT/V

Where n are respective moles, R is gas constant (<em>0,082atmL/molK</em>), T is teemperature (27°C=<em>300,15K</em>), V is volume (<em>9,0000L)</em>

Replacing:

Partial pressure SF₄: <em>0,134atm</em>

Partial pressure CO₂: <em>0,968atm</em>

Now, the sum of the partial pressures is the total pressure in the tank, that means:

Total pressure: 0,134atm + 0,968atm = <em>1,102atm</em>

<em></em>

I hope it helps!

6 0
3 years ago
What is the pH of the 1.0 M KOH solution?
Vadim26 [7]
So pH of the 1.0 * 10-2 mol-1 KOH is 12.
4 0
2 years ago
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