How many grams of O2(g) are needed to completely burn 73.7 g of C3H8(g)?

Answers

Answer 1

Answer: The balanced reaction is:

C3H8 + 5O2 = 3CO2 + 4H2O

We are given the amount of C3H8 to be reacted with O2. This will be the starting point of the calculations.

73.7 g C3H8 ( 1 mol C3H8/ 44.1 g C3H8 ) ( 5 mol O2 / 1 mol C3H8 ) ( 32.0 g O2 / 1 mol O2 ) = 267.39 g O2

Answer 2

Answer:

Answer: 267.2 grams

Explanation:

$C_3H_8+5O_2\rightarrow 3CO_2+4H_2O$

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

$\text{Number of moles of propane}=(73.7g)/(44.1g/mol)=1.67moles$

According to stoichiometry:

1 mole of $C_3H_8$ require 5 moles of $O_2$

Thus 1.67 moles of $C_3H_8$ will require = $(5)/(1)* 1.67=8.35moles$ of $O_2$

Mass of $O_2=moles* {\text {Molar mass}}=8.35moles* 32g/mol=267.2$

Thus 267.2 grams of oxygen are required.

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What does a 100 lb person weigh on Uranus

Answers

If you were 100 lb on Earth, you would be 92 lb on Uranus

Background Info:The standard enthalpy of formation (ΔH∘f) is the enthalpy change that occurs when exactly1 mol of a compound is formed from its constituent elements under standard conditions. The standard conditions are 1 atm pressure, a temperature of 25 ∘C , and all the species present at a concentration of 1 M . A "standard enthalpies of formation table" containing ΔH∘f values might look something like this:SubstanceΔH∘fH(g)218 kJ/molH2(g)0 kJ/molBa(s)0 kJ/molBa2+(aq)−538.4 kJ/molC(g)71 kJ/molC(s)0 kJ/molN(g)473 kJ/molO2(g)0 kJ/molO(g)249 kJ/molS2(g)129 kJ/mol

Question:
What is the balanced chemical equation for the reaction used to calculate ΔH∘f of BaCO3(s)?If fractional coefficients are required, enter them as a fraction (i.e. 1/3). Indicate the physical states using the abbreviation (s), (l), or (g) for solid, liquid, or gas, respectively. Use (aq) for aqueous solution.
EXPRESS ANSWER AS A CHEMICAL EQUATION. Please explain for me too!!!

Answers

You will get at first carbon dioxide by burning C:
$C+O_2=CO_2$
Burn hydrogen to obtain water:
$H_2+(1)/(2)O_2=H_2O$
Combine them:
$CO_2+H_2O=H_2CO_3$
Now react it with Ba:
$Ba+H_2CO_3=BaCO_3+H_2$
To sum up, the reaction is $Ba+C+(3)/(2)O_2=BaCO_3$ , using hydrogen as a catalyst.

Answer:

You will get at first carbon dioxide by burning C:

C+O_2=CO_2

Burn hydrogen to obtain water:

H_2+\frac{1}{2}O_2=H_2O

Combine them:

CO_2+H_2O=H_2CO_3

Now react it with Ba:

Ba+H_2CO_3=BaCO_3+H_2

To sum up, the reaction is Ba+C+\frac{3}{2}O_2=BaCO_3, using hydrogen as a catalyst.

Explanation:

Which type of solar radiation is the most powerful?

Answers

Answer:

The type of solar radiation that is the most powerful is the Ultraviolet Radiation.

Explanation:

Ultraviolet Radiation is the radiation that has the shortest wavelength (360 nanometers), which carries a lot of energy and interferes with molecular bonds. Especially those less than 300 nanometers, which can alter DNA molecules, very important for life. These waves are absorbed by the upper part of the atmosphere, especially by the ozone layer.

The damage that ultraviolet rays can cause to humans include effects on the skin such as irritation, wrinkles, loss of elasticity, spots and cancer; also possible conditions at the ocular level and can trigger systemic lupus erythematosus.

The most powerful type of solar radiation is known as gamma radiation.

Gamma radiation consists of high-energy photons and is part of the electromagnetic spectrum. It has the highest frequency and shortest wavelength among the various types of solar radiation, which include gamma rays, X-rays, ultraviolet (UV) radiation, visible light, infrared (IR) radiation, and radio waves. Gamma radiation is generated by nuclear reactions, such as those occurring in the core of the Sun and in other high-energy processes in the universe. Due to its high energy, gamma radiation can penetrate deeply into matter and has the potential to cause ionization and damage to living cells.

Therefore, it is important to limit exposure to gamma radiation and take appropriate safety precautions when working with radioactive materials or in environments with high levels of gamma radiation.

Learn more about solar radiation here:

brainly.com/question/32310977

#SPJ 6

True or false: physical changes occur when enough energy is released or absorbed from a substance

Answers

I believe it's true. Physical changes occur when enough energy is released or absorbed from a substance.

tert-Butyl alcohol is a solvent with a Kf of 9.10 ∘C/m and a freezing point of 25.5 ∘C. When 0.807 g of an unknown colorless liquid was dissolved in 11.6 g of tert-butyl alcohol, the solution froze at 15.3 ∘C.Which of the following is most likely the identity of this unknown liquid?tert-Butyl alcohol is a solvent with a of 9.10 and a freezing point of 25.5 . When 0.807 of an unknown colorless liquid was dissolved in 11.6 of tert-butyl alcohol, the solution froze at 15.3 .Which of the following is most likely the identity of this unknown liquid?ethylene glycol (molar mass = 62.07 g/mol)1-octanol (molar mass = 130.22 g/mol)glycerol (molar mass = 92.09 g/mol)2-pentanone (molar mass = 86.13 g/mol)1-butanol (molar mass = 74.12 g/mol)

Answers

Answer: ethylene glycol (molar mass = 62.07 g/mol)

Explanation:

Depression in freezing point :

Formula used for lowering in freezing point is,

$\Delta T_f=k_f* m$

or,

$\Delta T_f=k_f* \frac{\text{mass of solute}}{\text{molar mass of solute}* \text{weight of solvent in kg}}$

where,

$T_f$ = change in freezing point

$k_f$ = freezing point constant= $9.10^0C/m$

m = molality

Given mass of solute = 0.807 g

Molar mass of solute=? g/mol

weight of solvent in kg= 11.6 g=0.0116 kg

$\Delta T_f=T^(o)_f-T_f=25.5^0C-15.3^0C)=10.2^0C$

$10.2=9.10* \frac{0.807}{\text{molar mass of solute}* 0.0116kg}$

${\text{molar mass of solute}}=62.07 g/mol$

Thus the solute is ethylene glycol which has same molecular mass as calculated, i.e 62.07 g/mol.

What is the temperature of the oceanic crust?

Answers

The temperature of the oceanic crust increases with depth, reaching values typically in the range from about 500 °C(900 °F) to 1,000 °C (1,800 °F) at the boundary with the underlying mantle.

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