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Bumek [7]
3 years ago
15

NEED THIS NOW!! !

Chemistry
2 answers:
ivolga24 [154]3 years ago
8 0

Atoms cannot be created or detroyed, only rearranged.

saw5 [17]3 years ago
8 0
Your answer would be D
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Education in health<br>​
Illusion [34]

Answer:

Health education is a profession of educating people about health. Areas within this profession encompass environmental health, physical health, social health, emotional health, intellectual health, and spiritual health, as well as sexual and reproductive health education

4 0
3 years ago
Please help me !!!!
just olya [345]

Answer:

12, 28, 16

Explanation:

If we are trying to find mass, neutrons are our guy. 28 "mass points" means 28 neutrons. Each neutron is one point

We know there are 12 protons and electrons if we look at a table of elements, the number in the top-left is always the number of protons and we can subtract mass from the protons to get our electrons

3 0
3 years ago
Calculate the volume of carbon dioxide at 20.0°C and 0.941 atm produced from the complete combustion of 4.00 kg of methane. Comp
tankabanditka [31]

Answer:

The volume of carbon dioxide at 20.0°C and 0.941 atm produced was 6390.89 Liters.

More volume of carbon dioxide gas was released on combustion of 4.00 kg of propane in comparison to the volume of carbon dioxide released on combustion of 4.00 kg of methane.

Explanation:

Methane

CH_4+2O_2\rightarrow CO_2+2H_2O

Mass of methane = 4.00 kg = 4000 g (1 kg = 1000 g)

Moles of methane = \frac{4000 g}{16 g/mol}=250 mol

According to reaction, 1 mole of methane gives 1 mole of carbon dioxide gas,then 250 moles of methane will give :

\frac{1}{1}\times 250 mol=250 mol of carbon dioxide gas

Moles of carbon dioxide gas = n = 250 mol

Pressure of carbon dioxide gas = P = 0.941 atm

Temperature of carbon dioxide gas = T = 20.0°C = 20.0+273 K = 293 K

Volume of carbon dioxide gas = V

PV=nRT (Ideal gas equation)

V=\frac{nRT}{P}=\frac{250 mol\times 0.0821 atm L/mol K\times 293 K}{0.941 atm}=6390.89 L

The volume of carbon dioxide at 20.0°C and 0.941 atm produced was 6390.89 Liters.

Propane

C_3H_8+5O_2\rightarrow 3CO_2+4H_2O

Mass of propane = 4.00 kg = 4000 g (1 kg = 1000 g)

Moles of propane = \frac{4000 g}{44 g/mol}=90.91 mol

According to reaction, 1 mole of propane gives 3 mole of carbon dioxide gas,then 90.91 moles of propane will give :

\frac{3}{1}\times 90.91 mol=272.73 mol of carbon dioxide gas

Moles of carbon dioxide gas = n = 272.73 mol

Pressure of carbon dioxide gas = P = 0.941 atm

Temperature of carbon dioxide gas = T = 20.0°C = 20.0+273 K = 293 K

Volume of carbon dioxide gas = V

PV=nRT (Ideal gas equation)

V=\frac{nRT}{P}=\frac{272.73 mol\times 0.0821 atm L/mol K\times 293 K}{0.941 atm}=6,971.95 L

The volume of carbon dioxide at 20.0°C and 0.941 atm produced was 6,971.95 Liters.

Volume of carbon dioxide given by combustion of 4.00 kg of methane = 6390.89 Liters.

Volume of carbon dioxide given by combustion of 4.00 kg of propane = 6,971.95 Liters.

6390.89 Liters < 6,971.95 Liters

More volume of carbon dioxide gas was released on combustion of 4.00 kg of propane in comparison to the volume of carbon dioxide released on combustion of 4.00 kg of methane.

7 0
3 years ago
How many units long is the circumference of a circle with diameter of 18 units?
MakcuM [25]

Answer:

56.52 units

Explanation:

hope that helps :)

5 0
3 years ago
Read 2 more answers
Identify the white color precipitate that forms when k2so4(aq) and pb(no3)2(aq) are mixed.
bekas [8.4K]
<span>Here's your balanced chemical equation:

Pb(NO3)2</span><span> (aq) + K2SO4 (aq) </span>⇒<span> PbSO4 (s) + 2KNO3 (aq)

Therefore the precipitate formed is </span>lead(II) <span>sulfate.</span>
3 0
3 years ago
Read 2 more answers
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