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Lady bird [3.3K]
3 years ago
9

The diagram below represents a plan cell Letter X represents a structure in the cell ​

Chemistry
1 answer:
weeeeeb [17]3 years ago
4 0

the cell structure represented by x is the nucleus

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Barium has a positive charge of 2
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What is the molarity of 50gram of calcium carbonate is dissolved in 250ML of water​
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Answer:

Molar Mass of Calcium Carbonate = 100g

given mass = 50g

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Explanation:

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It takes 2,267 joules of heat to raise the temperature of a 44.5 gram sample of a metal from 33.9°C to 288.3°C. What is the heat
ehidna [41]

Answer:

\boxed{\text{0.200 J$^{\circ}$C$^{-1}$g$^{-1}$}}}

Explanation:

The formula for the amount heat q absorbed by a substance is

q = mcΔT

where

 m = the mass of the substance

  C = the specific heat capacity of the material

ΔT = the temperature change

Data:

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T₁ = 33.9 °C

T₂ = 288.3 °C

Calculations:

ΔT = (288.3 - 33.9) °C = 254.4 °C

\begin{array}{rcl}2267 & = & 44.5 \times C \times 254.4\\2267 & = & 11 180C\\C& = & \dfrac{2267}{11180}\\\\& = & \textbf{0.200 J$^{\circ}$C$^{-1}$g$^{-1}$}\\\end{array}

\text{The specific heat capacity of the metal is \boxed{\textbf{0.200 J$^{\circ}$C$^{-1}$g$^{-1}$}}}

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