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4 years ago

10

HELP I DON'T HAVE MUCH TIME PLZ HELP ME IF YOU ARE REALLY GOOD AT SCIENCE COME TO MY QUESTION PLEASEEEE Which fossil fuel create

s the least amount of pollution when it is burned? A. bituminous coal B. petroleum C. natural gas D. anthracite

1 answer:

Bas_tet [7]4 years ago

6 0

Hey there!
The correct answer is C

Hope this helps you!

Always remember, you are a Work Of Art!
- Nicole :) <3

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Living things within an ecosystem

ohaa [14]

Living things included are organisms like animals, plants, bacteria and insects, as well as nonliving components like rocks, soil, sunlight and water.

Hope this helps!! would appreciate a brainliest!

7 0

3 years ago

1. A scientist studies the reaction 2NO2(g) 2NO(g) + O2(g). She performs three experiments using different concentrations of NO2

DIA [1.3K]

A. The concentration ratio between trials 2 and 1 is: 0.3 / 0.1 = 3.
B. The ratio between reaction rates is: 0.054 / 0.006 = 9.
C. We solve the equation: (concentration ratio)^x = (reaction rate ratio): $3^x = 9$ , which gives x = 2, and the exponent in the rate law is 2.
D. The rate law will have the equation: r = k[NO2]^2
E. To solve for k, we can substitute the values for [NO2] = 0.1, rate = 0.006. This gives: $0.006 = k(0.1)^2$ , which yields k = 0.6 L/mol-s.
F. Since the exponent is 2, this is a second-order reaction.

6 0

3 years ago

Which of the following best describes what a catalyst does?

aleksandrvk [35]

A catalysts lowers activation energy

3 0

4 years ago

Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide accordin

Rudik [331]

Answer:

The limiting reactant is NaOH (option B)

Explanation:

2S(s) + 3O₂(g) + 4NaOH(aq) → 2Na₂SO₄(aq) + 2H₂O(l)

The reaction is ballanced. OK

We need to know how many moles do we have from each compound.

Mass / Molar weight = Mol

Molar weight S = 32 g/m

Molar weight O₂ = 32 g/m

Molar weight NaOH = 40 g/m

Mol S: 2g/ 32g/m = 0.0625 mol

Mol O₂: 3g / 32 g/m = 0.09375 mol

Mol NaOH: 4g/ 40g/m = 0.1 mol

Now, we can play with the reactants. The base is: 2 moles of S, react with 3 mol of O₂ and 4 moles of hydroxide to make 2 moles of sulfate and 2 moles of water. Pay attention to the rules of three.

2 moles of S __ react with __ 3 moles of O₂ __ and __ 4 moles of NaOH

0.0625 moles S __________ 0.09375 moles O₂ ___ 0.125 moles NaOH

The limiting reactant is the NaOH. I need to use 0.125 moles and I only have 0.1 moles.

Let's do the same with O₂

3 moles of O₂ __ react with __ 2 moles of S __ and __ 4 moles of NaOH

0.09375 moles of O₂ _______ 0.0625 mol of S _____ 0.125 moles NaOH

5 0

3 years ago

What is the volume of 45.0 grams of nitrogen monoxide , NO

gladu [14]

Answer:

$V=37.05\ L$

Explanation:

Given that:

Mass of $NO$ , m = 45.0 g

Molar mass of $NO$ , M = 30.01 g/mol

Temperature = 20.0 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T₁ = (20.0 + 273.15) K = 293.15 K

V = ?

Pressure = 740 mm Hg

Considering,

$n=\frac{m}{M}$

Using ideal gas equation as:

$PV=\frac{m}{M}RT$

where,

P is the pressure

V is the volume

m is the mass of the gas

M is the molar mass of the gas

T is the temperature

R is Gas constant having value = 62.36367 L. mmHg/K. mol

Applying the values in the above equation as:-

$740\times V=\frac{45.0}{30.01}\times 62.36367\times 293.15$

$740V=\frac{822685.94372}{30.01}$

$V=37.05\ L$

3 0

3 years ago