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masya89 [10]
3 years ago
10

A sample of a substance has a mass of 4.2 grams and a volume of 6 milliliters. The density of this substance BLANK) ( grams/mill

iliter.
Chemistry
2 answers:
elena55 [62]3 years ago
3 0

0.7 my teacher just gave me the answer i got too lazy to explain why

kondor19780726 [428]3 years ago
3 0

Answer:- Density of the substance is 0.7\frac{g}{mL} .

Solution:- Density is directly proportional to mass and inversely proportional to volume. The density formula is:

d=\frac{M}{V}

where d stands for density, M stands for mass and V stands for volume.

Given mass is 4.2 grams and the volume is 6 mL. Let's plug in the values of mass and volume in the formula to calculate the density.

d=\frac{4.2g}{6mL}

d=0.7\frac{g}{mL}

So, the density of the substance is 0.7\frac{g}{mL} .

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Can someone help me pls?<br> Zr + O ⇒ <br> B + O ⇒<br> Zn + C ⇒ <br> Co + I ⇒ <br> Mg + Br ⇒
Korolek [52]

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8 0
3 years ago
Choose the mole ratio below that is INCORRECT based on the given balanced equation:
sdas [7]

Answer:

4 moles CO₂ = 4 moles O₂

Explanation:

The incorrect mole ratio is 4 moles CO₂ = 4 moles O₂.

 Let us write the reaction equation:

          2C₂H₅OH + 7O₂ → 4CO₂ +  6H₂O

To write mole ratios in a chemical reaction, we must ensure the equation is balanced.

Since the given expression is balanced,

   Then 4 moles CO₂ = 4 moles O₂ is not correct;

 Rather;

            4 moles CO₂ = 7 moles O₂ is the right expression

6 0
3 years ago
What is the change in internal energy for each of the following situations? 1. q-7.9 J out of the system and w 3.6 J done on the
adoni [48]

Answer:

A i. Internal energy ΔU = -4.3 J ii. Internal energy ΔU = -6.0 J B. The second system is lower in energy.

Explanation:

A. We know that the internal energy,ΔU = q + w where q = quantity of heat and w = work done on system.

1. In the above q = -7.9 J (the negative indicating heat loss by the system). w = 3.6 J (It is positive because work is done on the system). So, the internal energy for this system is ΔU₁ = q + w = -7.9J + 3.6J = -4.3 J

ii. From the question q = +1.5 J (the positive indicating heat into the system). w = -7.5 J (It is negative because work is done by the system). So, the internal energy for this system is ΔU₂ = q + w = +1.5J + (-7.5J) = +1.5J - 7.5J = - 6.0J

B. We know that ΔU = U₂ - U₁ where U₁ and U₂ are the initial and final internal energies of the system. Since for the systems above, the initial internal energies U₁ are the same, then we say U₁ = U. Let U₁ and U₂ now represent the final energies of both systems in A i and A ii above. So, we write ΔU₁ = U₁ - U and ΔU₂ = U₂ - U where ΔU₁ and ΔU₂ are the internal energy changes in A i and A ii respectively. Now from ΔU₁ = U₁ - U, U₁ = ΔU₁ + U and U₂ = ΔU₂ + U. Subtracting both equations U₁ - U₂ = ΔU₁ - ΔU₂

= -4.3J -(-6.0 J)= 1.7 J. Since U₁ - U₂ > 0 , U₂ < U₁ , so the second system's internal energy increase less and is lower in energy and is more stable.

8 0
3 years ago
Is the cyanide ion a strong or weak base?
11111nata11111 [884]
It's a weak base bacause H C N is weak
4 0
3 years ago
Convert 2.39 x 1022 molecules of water into moles of water
torisob [31]

Answer:

0.0397\ \text{mol}

Explanation:

Number of molecules of water = 2.39\times 10^{22}

N_A = Avogadro's number = 6.022\times 10^{23}\ \text{mol}^{-1}

Number of moles is given by

\dfrac{2.39\times 10^{22}}{6.022\times 10^{23}}

=0.0397\ \text{mol}

The number of moles of water is 0.0397\ \text{mol}.

6 0
3 years ago
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