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OverLord2011 [107]
3 years ago
11

Which element has the least density at STP?

Chemistry
1 answer:
vladimir2022 [97]3 years ago
8 0

Answer:

Helium, this noble gas has the least density at STP

Explanation:

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A sample of aluminum, which has a specific heat capacity of 0.897·J·g−1°C^−1 , is put into a calorimeter (see sketch at right) t
Tcecarenko [31]

Answer: The mass of aluminium sample is 55.4 gram

Explanation:

Q_{absorbed}=Q_{released}

As we know that,  

Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})

m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)]      

where,

m_1 = mass of aluminium = ?

m_2 = mass of water = 300.0 g

T_{final} = final temperature = 23.8^0C

T_1 = temperature of aluminium = 94.5^oC

T_2 = temperature of water = 21.0^oC

c_1 = specific heat of aluminium = 0.897J/g^0C

c_2 = specific heat of water =  4.184J/g^0C

Now put all the given values in equation (1), we get

-[m_1\times c_1\times (T_{final}-T_1)]=[m_2\times c_2\times (T_{final}-T_2)]

-[m_1\times 0.897\times (23.8-94.5)^0C]=[300.0g\times 4.184\times (23.8-21.0)]

m_1=55.4g

Therefore, the mass of aluminium sample is 55.4 gram

8 0
3 years ago
When thermal energy is added to an object, what happens to the motion of the particles?
Novay_Z [31]
The atoms start vibrating faster
3 0
3 years ago
What was the purpose of letting the transformed cells sit in LB for a few minutes before spreading them onto the plates?
AlekseyPX
I think c ... C this is the correct
8 0
3 years ago
Difine the term compound​
AlexFokin [52]

Answer:

Its when like two pure substances are like combined into one.

Explanation:

8 0
3 years ago
If the concentration of Mg2+ in the solution were 0.039 M, what minimum [OH−] triggers precipitation of the Mg2+ ion? (Ksp=2.06×
Elodia [21]

Answer:

2.30 × 10⁻⁶ M

Explanation:

Step 1: Given data

Concentration of Mg²⁺ ([Mg²⁺]): 0.039 M

Solubility product constant of Mg(OH)₂ (Ksp): 2.06 × 10⁻¹³

Step 2: Write the reaction for the solution of Mg(OH)₂

Mg(OH)₂(s) ⇄ Mg²⁺(aq) + 2 OH⁻(aq)

Step 3: Calculate the minimum [OH⁻] required to trigger the precipitation of Mg²⁺ as Mg(OH)₂

We will use the following expression.

Ksp = 2.06 × 10⁻¹³ = [Mg²⁺] × [OH⁻]²

[OH⁻] = 2.30 × 10⁻⁶ M

3 0
3 years ago
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