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4 years ago

Convert 3 moles of h2o into grams

1 answer:

4 0

To convert 3 mol H2O to grams, just multiply by the molar mass of H2O.

<span>3 mol H2O * 18 g H2O / 1 mol H2O = 54 g H2O

Hope this helped.</span>

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Consider the reaction Cu + AgNO3 Ag + CUNO3 Which element is reduced? Which element is the oxidizing agent?

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Answer:

silver is reduced and copper is oxidized

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3 years ago

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Which is the reason that ionic compounds are brittle? The bonds between the anions and cations are weak and therefore easily bro

bearhunter [10]

Well ionic compounds are brittle because similar charges repel, which causes them to break usually occurring when a force is applied, like a hammer strike.

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3 years ago

If someone told you they had a career in either ecology, paleontology, or botany, what area of science is this?

cestrela7 [59]

Natural Science. Although I don't know whether paleontology counts as a nautral science.

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3 years ago

Select the correct image. Which element is a noble gas?

andrey2020 [161]

Answer:

He (Helium)

Explanation:

According to the Periodic Table, our noble gases are:

Helium - Element 2

Neon - Element 10

Argon - Element 18

Krypton - Element 46

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Radon - Element 86

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4 years ago

Photons of infrared radiation are responsible for much of the warmth we feel when holding our hands before a fire. These photons

KIM [24]

Answer:

$8.3\cdot 10^{22}$ photons

Explanation:

The energy of a photon is given by

$E_1 = \frac{hc}{\lambda}$

where

$h=6.63\cdot 10^{-34} Js$ is the Planck constant

$c=3.0\cdot 10^8 m/s$ is the speed of light

$\lambda$ is the photon wavelength

Here we have

$\lambda=1.5\cdot 10^{-6} m$

So, the energy of 1 of these infrared photons is

$E_1=\frac{(6.63\cdot 10^{-34})(3\cdot 10^8)}{1.5\cdot 10^{-6}}=1.32\cdot 10^{-19} J$

The amount of energy needed to increase the temperature of the cup of water is:

$E=mC\Delta T$

where

m = 175 g is the mass

$C=4.186 J/gC$ is the specific heat capacity

$\Delta T=40-25=15^{\circ}C$ is the increase in temperature

So,

$E=(175)(4.186)(15)=10,988 J$

Therefore, the number of photons needed is:

$n=\frac{E}{E_1}=\frac{10,988}{1.32\cdot 10^{-19}}=8.3\cdot 10^{22}$

5 0

3 years ago