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DIA [1.3K]
3 years ago
12

Is colour a chemical or physical

Chemistry
1 answer:
dexar [7]3 years ago
6 0

Answer:

Physical property

Explanation:

hope this helped!

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How many moles of na2co3 would be needed to react with 750 ml of 0.250 m h2so4 solution?
olga2289 [7]

0.1875 mol of Na2CO3 needed to react with the 750 mL of 0.250 M H2SO4.

The given reaction between Na2CO3 and H2SO4 are already balanced.

Na2CO3 + H2SO4 → Na2SO4 + CO2.H2O

First, let us determine the number of moles of H2SO4.

Molarity (mol/L) = number of moles of H2SO4 / volume of H2SO4

0.250 M = number of moles of H2SO4 / [(750 mL)(1 L/1000 mL)]

number of moles of H2SO4 = 0.1875 mol

Then, let us determine the number of moles of Na2CO3 that would react with 0.1875 mol H2SO4.

number of moles of Na2CO3 = moles of H2SO4 * stoichiometric ratio

number of moles of Na2CO3 = 0.1875 mol H2SO4 * (1 mol Na2CO3/ mol H2SO4)

number of moles of Na2CO3 = 0.1875 mol Na2CO3

To learn more, please refer tohttps://brainly.com/question/16200580.

#SPJ4

3 0
1 year ago
What is the mass of KOH found in a 785 mL of a 1.43 M solution of KOH
My name is Ann [436]

Molarity is defined as the ratio of number of moles to the volume of solution in litres.

The mathematical expression is given as:

Molarity = \frac{Number of moles}{volume of solution in litres}

Here, molarity is equal to 1.43 M and volume is equal to 785 mL.

Convert mL into L

As, 1 mL = 0.001 L

Thus, volume = 785\times 0.001 = 0.785 L

Rearrange the formula of molarity in terms of number of moles:

Number of moles =molarity\times volume of solution in litres

n = 1.43 M \times 0.785 L

= 1.12255 mole

Now,  Number of moles  = \frac{mass in g}{molar mass}

Molar mass of potassium hydroxide  = 56.10 g/mol

1.12255 mole  = \frac{mass in g}{56.10 g/mol}

mass in g = 1.12255 mole\times 56.10 g/mol

= 62.97 g

Hence, mass of KOH = 62.97 g



7 0
3 years ago
What are the four types of biological molecules and their main function in the human body?
Flauer [41]

Answer:

There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids)

Explanation:

There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids), and each is an important component of the cell and performs a wide array of functions. ... Biological macromolecules are organic, meaning that they contain carbon.

7 0
4 years ago
Solve the following problem and round the correct number of significant
RUDIKE [14]

Answer:

4.5 + 2.34 = 6.8

Sig Figs:

2

Decimals:

1

Scientific Notation:

6.8 × 10ⁿ

Words:

six point eight

5 0
3 years ago
A container holds 6. 4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.
ipn [44]

In a mixture of gases, the total pressure is equivalent to the aggregate of all the partial pressures of the single element of the gas.

It can be written as \rm P _{total} = P₁ + P₂ +  P₃ and so on.

The partial pressure will be:

Option A. 0. 31 atm

Pressure can be estimated by:

<u>PV = nRT</u>

\rm P_{total} = \dfrac{n _{total }RT}{ V}

\rm P_{total} = \dfrac{n _{H_{2}} + n _{\rm other \;gases}}{ V}

Where,

\rm nH_{2} = 25\% \times n_{Total}

And,

\begin{aligned}\rm P_{H_{2}} &= 25\% \times \rm P_{Total}\\\\& = 25\% \times 1.24 \;\rm atm\\\\& = 1.24 \rm \;atm \times 25 \end{aligned}

Solving finally we get,

\rm  P_{H_{2}} = 0.31 \;\rm atm

Therefore, 0.31 atm is the partial pressure of the hydrogen gas.

To learn more about partial pressure follow the link:

brainly.com/question/1471705

3 0
3 years ago
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