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3 years ago

WILL GIVE BRAINLIEST NO FAKE ANSWERS PLEASE I WILL REPORT

Chemistry

1 answer:

Nat2105 [25]3 years ago

8 0

Answer:

3.0 moles of water

Explanation:

Having the balanced equation of water production

2H2 (g) + O2 (g) -----> 2H2O (g)

Given that 3.0 moles of hydrogen gas reacts with 1.8 moles of oxygen gas

from the 2 moles of hydrogen are required to react with 1 mole of oxygen

1.8 moles of oxygen,requires 1.8 mol O2 x 2 mol H2/ 1 mol O2 = 3.6 mol H2

this means that H2 is the limiting reagent while oxygen is in excess,thus we use the moles of H2 to find the ,moles of water produced.

from the equation, 2 moles of H2 produces 2 moles of H2O

moles of H2O = 3.0 mol H2 x 2 mol H2O/ 2mol H2 = 3.0 molH2O

Therefore 3.0 moles of water are produced.

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A gas at STP occupies 16 L of space. If the pressure changes to 2.6 atm and the temperature increases to 195 degrees C, what is

Tju [1.3M]

The new volume of a gas at STP that occupies 16L of space is 27.43L.

<h3>HOW TO CALCULATE VOLUME?</h3>

The volume of a given gas can be calculated using the following expression:

P1V1/T1 = P2V2/T2

Where;

P1 = initial pressure
P2 = final pressure
V1 = initial volume
V2 = final volume
T1 = initial temperature
T2 = final temperature

1 × 16/273 = 2.6 × V2/468

16/273 = 2.6V2/468

0.0586 × 468 = 2.6V2

V2 = 27.43

Therefore, the new volume of a gas at STP that occupies 16L of space is 27.43L.

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3 years ago

Why are polymers better for mouthguards?

denpristay [2]

The mouth

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4 years ago

___________ is the ability of an object to carry electricity.

Lelu [443]

Answer:

Electrical conductivity

Explanation:

note the words electrical and conductivity.

Electrical + conductivity = the ability of an object to carry electricity

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3 years ago

Which substance is a base? HCOOH RbOH H2CO3 NaNO3

Alex Ar [27]

Answer:

RbOH

Explanation:

For this question, we have to remember what is the definition of a base. A base is a compound that has the <u>ability to produce hydroxyl ions</u> $OH^-$ , so:

$AOH~->~A^+~+~OH^-$

With this in mind we can write the <u>reaction for each substance:</u>

$HCOOH~->~HCOO^-~+~H^+$

$RbOH~->~Rb^+~+~OH^-$

$H_2CO_3~->~CO_3^-^2~+~2H^+$

$NaNO_3~->~Na^+~+~NO_3^-$

The only compound that fits with the definition is $RbOH$ , so this is our <u>base</u>.

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3 years ago

Read 2 more answers

When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 x 10-19 J. What is the frequency of th

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When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

<h3>How to calculate the frequency of photon ?</h3>

To calculate the frequency of photon use the expression

E = hv

where,

E = Energy

h = Planck's Constant

v = frequency (Hz)

Put the value in above formula we get

E = hv

2.94 × 10⁻¹⁹ = 6.6 × 10⁻³⁴ × v

v = $\frac{2.94 \times 10^{-19}\ J}{6.6 \times 10^{-34}}$

= 0.44 × 10¹⁵

= 4.4 × 10¹⁴

Thus from the above conclusion we can say that When an electron in an atom absorbed a photon, the energy of the electron changed by 2.94 × 10⁻¹⁹. The frequency of the photon is 4.4 × 10¹⁴ Hertz .

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2 years ago