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Gwar [14]
2 years ago
8

Hii can someone help me pls this is the last question

Chemistry
1 answer:
lara31 [8.8K]2 years ago
8 0

Answer:

B. 126

Explanation:

the scale is 1 to 42 so the scale would be:

3 cm:x cm

3 * 42 = 126 cm

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Water was added to 175 mL of a KOH solution until the volume was 250 mL and the molarity was 0.315 M. What was the molarity of t
Len [333]

Answer:  The molarity of the initial concentrated solution is 0.450 M

Explanation:

According to the dilution law,

M_1V_1=M_2V_2

where,

M_1 = Molarity of concentrated KOH solution = ?

V_1 = volume of  concentrated KOH solution = 175 ml

C_2 = concentration of diluted KOH solution= 0.315 M

V_2 = volume of diluted KOH solution= 250 ml

Putting in the values, we get:

M_1\times 175=0.315\times 250

M_1=0.450M

Thus the molarity of the initial concentrated solution is 0.450 M

6 0
3 years ago
If 700 g of water at 90 °C loses 27 kJ of heat, what is its final temperature?​
Phoenix [80]

Answer:

If 700 g of water at 90 °C loses 27 kJ of heat, its final temperature is 106.125 °C

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also increases; and the same happens when either of the two decreases .). The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature, ΔT= Tfinal - Tinitial

In this case:

  • Q= 27 kJ= 27,000 J (being 1 kJ=1,000 J)
  • c=4.186 \frac{J}{g* C}
  • m=700 g
  • ΔT= Tfinal - Tinitial= Tfinal - 90 °C

Replacing:

27,000 J=4.186 \frac{J}{g* C}*400 g* (Tfinal - 90C)\\

Solving:

27,000 J=1,674.4 \frac{J}{C}* (Tfinal - 90C)

\frac{27,000 J}{1,674.4 \frac{J}{C}} =(Tfinal - 90C)

16.125 °C= Tfinal - 90 °C

Tfinal= 16.125 °C + 90 °C

Tfinal= 106.125 °C

<u><em>If 700 g of water at 90 °C loses 27 kJ of heat, its final temperature is 106.125 °C</em></u>

3 0
3 years ago
PLS HELP I GIVE BRANLIEST !!!
yarga [219]

Explanation:

D. The total mass of the reactants equals the total mass of the

products.

6 0
3 years ago
According to their locations on the Periodic Table, argon (Ar) and neon (Ne) are
a_sh-v [17]
Your answer would be (D), Noble Gases, or Inert Gases - The far right on the periodic table is also known as Group(0)., or Group 18 on the periodic table. Elements in this group includes, Neon(NE), Argon(AR), Krypton(KR), Xenon(XE), and Radon(RN).





Hope that helps!!!
3 0
3 years ago
Read 2 more answers
What is in the solar system?
Zina [86]

Answer:

All of the above

Explanation:

All of this is in the solar system.

7 0
3 years ago
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