How many grams are needed to prepare 1.50L of a 1.50M solution of NaNO3?

A ____________ star would have the hottest surface temperature.

Alexandra [31]

Answer:

Blue

Explanation:

If you look at a flame, blue is always at the bottom right? So that would be common sense that blue would be the hottest.

7 0

3 years ago

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How many molecules are in 41.8 g of sulfuric acid

Anton [14]

Answer

× 10²³ molecules are in 41.8 g of sulfuric acid

Explanation

The first step is to convert 41.8 g of sulfuric acid to moles by dividing the mass of sulfuric acid by its molar mass.

Molar mass of sulfuric acid, H₂SO₄ = 98.079 g/mol

$Mole=\frac{Mass}{Molar\text{ }mass}=\frac{41.8\text{ }g}{98.079\text{ }g\text{/}mol}=0.426187053\text{ }mol$

Finally, convert the moles of sulfuric acid to molecules using Avogadro's number.

Conversion factor: 1 mole of any substance = 6.022 × 10²³ molecules.

Therefore, 0.426187053 moles of sulfuric acid is equal

$\frac{0.426187053\text{ }mol}{1\text{ }mol}\times6.022×10²³\text{ }molecules=2.57\times10^{23}\text{ }molecules$

Thus, 2.57 × 10²³ molecules are in 41.8 g of sulfuric acid.

3 0

9 months ago

Write a 4-line paragraph to explain what is melting.

natali 33 [55]

Answer:

Melting is the process of being changed from a solid to a liquid state especially by the application of heat. This occurs when the energy of the solid increases, which increases the substance's temperature to the melting point. Typically, the solids energy increases by the application of heat or pressure. At the melting point, the ordering of molecules in the solid breaks down to a less ordered state, and the solid "melts" to become a liquid.

hope this helps! :)

7 0

2 years ago

How many moles in 3.69 x 10^30 molecules of carbon dioxide?

Sedaia [141]

$0.612 \times 10^{7} \text { moles of } \mathrm{CO}_{2}$ are present in $3.69 \times 10^{30} \text { molecules of } \mathrm{CO}_{2}$

<u>Explanation:</u>

It is known that each mole of an element is composed of avagadro's number of molecules. So if we need to determine, we need to divide the number of molecules with the avagadro's number.

So,

$1 mol of element =6.02 \times 10^{23} molecules of element$

As here $3.69 \times 10^{30}$ molecules of carbon di oxide is given. So the moles in it will be

No. of moles of carbon dioxide = $\frac{3.69 \times 10^{30}}{6.02 \times 10^{23}}$

No. of moles = $0.612 \times 10^{7}$ moles of carbon dioxide.

Thus,

$0.612 \times 10^{7}$ of carbon dioxide are present in $3.69 \times 10^{30} \text { molecules of } \mathrm{CO}_{2}$ .

4 0

2 years ago

In the iodoform test why is it necessary to add sodium hypochlorite

Kobotan [32]

Sodium hypochlorite is used in iodoform test for the oxidation of alcohol to aldehyde as shown in the image attached:

Here sodium hypochlorite is formed by the reaction of NaOH with I2 that further oxides alcohols to aldehydes.

8 0

2 years ago