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padilas [110]
4 years ago
5

A sample of nitrogen in a glass bulb has a mass of 245 mg. What is this mass in kilograms? Give your answer to the correct numbe

r of significant figures.
Chemistry
2 answers:
OverLord2011 [107]4 years ago
8 0

Answer:

the answer is 0.000245kg

Explanation:

hope it helps

LekaFEV [45]4 years ago
3 0
1 mg = 10⁻⁶ kg

245 mg = 245·10⁻⁶ kg = 2.45·10⁻⁴ kg
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At a fixed pressure, if the temperature is doubled, the volume of a gas will be
Scrat [10]

Answer:

Doubled.

Explanation:

The relationship between the temperature and the volume of a gas at a constant pressure can be described using Charles' law:

  • V₁*T₂ = V₂*T₁

That means that the temperature and the volume of a gas are directly proportional: The higher the temperature, the higher the pressure. If one of those factors is increased twofold, the other one will be increased twofold as well.

7 0
3 years ago
Heats of reaction calculated from bond energies and from heats of formation are often, but not always, close to each other.a. In
postnew [5]

Answer:

45.7kj

Explanation:

To calculates the heats of reaction from heats of formation:

∆Hr=£∆Hp -£∆Hr

= £∆Hch3ChOH - £∆HCh2h2+h20

=(-235.1kj)-(+52.47kj/kg + (-241.8kj/kg)

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3 years ago
In a closed container, the vapor pressure of 10 mL of ethanol at 20 degrees C is 5.85 kPa. What is the vapor pressure of 20 mL o
natulia [17]

Answer:

{P_2}=2.925\ kPa

Explanation:

At same temperature and same number of moles, Using Boyle's law  

{P_1}\times {V_1}={P_2}\times {V_2}

Given ,  

V₁ = 10 mL

V₂ = 20 mL

P₁ = 5.85 kPa

P₂ = ?

Using above equation as:

{P_1}\times {V_1}={P_2}\times {V_2}

{5.85\ kPa}\times {10\ mL}={P_2}\times {20\ mL}

{P_2}=\frac{{5.85}\times {10}}{20}\ kPa

{P_2}=2.925\ kPa

6 0
4 years ago
Classify each orbital diagram for ground-state electron configurations by the rule or principle it violates.
nignag [31]
Thank you for posting your question here at brainly. I hope the answer will help. Please see below:

Aufbau violation:
4s ↑↓ 3d ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 5s ↑
<span>3s ↑ 3p ↑ ↑ ↑ </span>
<span>Hund violation: </span>
<span>4s ↑↓ 3d ↑↓ ↑ ↓ ↑ ↑ </span>
3s ↑↓ 3p ↑↓ ↑↓
Pauli violation
<span>2s ↑↑ 2p ↑ ↑ ↑</span>
6 0
4 years ago
The ideal gas law is a combination of all the gas laws and states that PV = nRT. The value of n stands for
dimaraw [331]

Answer:

d

Explanation:

p is pressure, v is vo;lume, t is temperature, r is ideal gas contstant, therefore n is the moles

7 0
3 years ago
Read 2 more answers
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