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IRINA_888 [86]
3 years ago
13

What is the chemical formula for Sodium bicarbonate

Chemistry
1 answer:
Cloud [144]3 years ago
5 0

Answer: Na2CO3

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The volume of a gas at 5.0 atm is 3.5 L. What is the volume of the gas at 7.0 atm at the same temperature?
Gemiola [76]

Answer:

2.5 L.

Explanation:

  • We can use the general law of ideal gas: <em>PV = nRT.</em>

where, P is the pressure of the gas in atm.

V is the volume of the gas in L.

n is the no. of moles of the gas in mol.

R is the general gas constant,

T is the temperature of the gas in K.

  • If n and T are constant, and have two different values of V and P:

<em>P₁V₁ = P₂V₂ </em>

P₁ = 5.0 atm, V₁ = 3.5 L.

P₂ = 7.0 atm, V₂ = ??? L.

<em>∴ V₂ = P₁V₁/P₂ </em>= (5.0 atm)(3.5 L)/(7.0 atm) = <em>2.5 L. </em>

6 0
4 years ago
Read 2 more answers
9. Which of the following accurately describes circuits?
Zigmanuir [339]
C. that is the answer to the question
8 0
3 years ago
A mixture of two or more elements at least one of which is a metal is called
Mrac [35]

Answer:

Alloy

Explanation:

Alloy: An alloy is a substance prepared by adding one or more element to a base or parent metal to obtain desirable products. The added element are usually metals or carbon. An alloy can be considered as a uniform mixture.

Examples of Alloy:

⇒ Brass is an alloy that contains 60 - 80% of copper and 20- 40% of zinc.

⇒Bronze is an alloy that contains 90% of copper and 10% of tin.

⇒ Steel is an alloy that contains  99.8% of iron and 0.2% of carbon.

Uses of Alloys:

⇒ They are used for making coins and medals

⇒ They are used in the construction of aircraft, ships and cars.

⇒They are used for making electromagnet.

8 0
4 years ago
Which best describes Rutherford’s model of the atom? fish swimming in an aquarium a sports stadium with a marble at the center a
puteri [66]
Rutherford's model of the atom is also known as the planetary model because this is when he discovered the nucleus of the atom. He also discovered that the nucleus of the atom, located at the center of an atom, is only 1/3000th the size of the atom's diameter. Also, surrounding the nucleus is an electron cloud. Therefore, the best description of his model would be <span>a sports stadium with a marble at the center.</span>
8 0
3 years ago
Read 2 more answers
The molarity of a 4.200 L solution is 1.230 M Na2CO3. What is the mass of Na2CO3
Lerok [7]

Answer:

547.5g

Explanation:

To get the mass, you need moles.

moles = (molarity)(Liters)

moles = (1.230M)(4.200L) = 5.166 moles Na2CO3

Now, just use stoichiometry

molar mass of Na2CO3 = 2(mass of Na) + (mass of C) + 3(mass of O)

= 2(22.9) + 12.01 + 3(16) = 105.99g/mol

5.166moles(105.99g/mol)

= 547.544

But, the measurements given had 4 significant figures, so in chemistry we write:

547.5g

7 0
3 years ago
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