Question

Calculate the mass of calcium oxide produced when 200g of calcium carbonate is heated strongly.
(given: Atomic mass of calcium= 40amu, atomic mass of oxygen=16 amu. Atomic mass of carbon = 12amu

Answer 1

Answer:

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Answer 2

Question:-

• Calculate the mass of calcium oxide produced when 200g of calcium carbonate is heated strongly.

Answer:-

• The weight of the calcium oxide produced will be 112 grams

Explanation:-

Given that:-

• Atomic mass of calcium = 40 amu
• Atomic mass of oxygen = 16 amu
• Atomic mass of carbon = 1222 amu

To Find:-

• The atomic mass of calcium oxide ( CaO )

Required Solution:-

― Since we know that on heating of calcium carbonate the products formed are calcium oxide and carbon dioxide

$\bullet \;\;\; \sf CaO + CO_2 \leftrightharpoons CaCO_3$  

Now let's calculate the molar mass of CaCO₃ but before that let's understand what is it actually

${\large{\purple{\mathbb{WHAT \; IS \; MOLAR \; MASS \; ?}}}}$

Molar mass refers to mass of 1 mole of substance which in grams , Don't worry lemme make this more clear :)

1 mole contains  6.022 × 10²³ number of atoms! note that molar mass is always expressed in grams and this similar to molecular mass but the only difference is between the units. Molecular mass is always expressed in amu but where as molar mass is expressed in grams

$\bf Example :$

✯ Molecular mass of neon is 20 amu where as molar mass is 20 grams

✯ Molecular mass of hydrogen is 1 amu but where as the molar mass is 1 gram

Similarly this applies to all the elements , Now let's get back to what we were supposed to do

Calculating the molar mass of Calcium carbonate

$\bigstar$ As we have given the molecular masses of the elements now let's change the units to find out the molar masses

• Molar mass of Calcium is 40 grams
• Molar mass of Oxygen is 16 grams
• Molar mass of Carbon is 12 grams

― Now let's find out the the molar mass of 1 mole of CaCO₃

${ \longrightarrow } \; \sf Molar \; mass \; of \; CaCO_3 = 40 \; g + 12 \; g + 3(16) g$

${ \longrightarrow } \; \sf Molar \; mass \; of \; CaCO_3 = 40 \; g + 12 \; g + 48 \;g$

${ \longrightarrow } \; \sf Molar \; mass \; of \; CaCO_3 = 100 \; g$  

― By this we can state that the molar mass of 1 mole of calcium carbon is equal to 100 grams since we've been said that 200 grams of CaCO₃ is heated up which means that 2 moles of the substance is heated

As per the above knowledge wee can state that  moles of CaCO₃ on being heated would give rise to 2 moles of CaO and CO₂

Calculating the molar mass of  moles of CaO

→ Molar mass of CaO = 2 [ 40 grams + 16 grams ]

→ Molar mass of CaO = 2 [ 56 grams ]

→ Molar mass of CaO = 112 grams

Therefore:-

• The mass of calcium oxide produced is 112 grams

Additional info :-

• Reactivity series

$\begin{gathered}\begin{gathered}\begin{gathered} \tiny\boxed{\begin{array}{ c |c} \frak{ \pmb{symbol}}& \rm{ \pmb{metal}}\\ \dfrac{\qquad\qquad}{ \sf K}&\dfrac{\qquad\qquad}{ \sf 80 \: cm}& \\ \dfrac{\qquad\qquad}{ \sf Na}& \dfrac{\qquad\qquad}{ \sf sodium}& \\ \dfrac{\qquad\qquad}{ \sf Ca}&\dfrac{\qquad\qquad}{ \sf calcium }& \\ \dfrac{\qquad\qquad}{ \sf Mg}&\dfrac{\qquad\qquad}{ \sf magnesium }& \\ \dfrac{\qquad\qquad}{ \sf \: Al }&\dfrac{\qquad\qquad}{ \sf aluminium }& \\ \dfrac{\qquad\qquad}{ \sf Zn}&\dfrac{\qquad\qquad}{ \sf zinc }& \\ \dfrac{\qquad\qquad}{ \sf Fe}&\dfrac{\qquad\qquad}{ \sf iron }& \\ \dfrac{\qquad\qquad}{ \sf Pb}&\dfrac{\qquad\qquad}{ \sf lead }& \\ \dfrac{\qquad\qquad}{ \sf H}&\dfrac{\qquad\qquad}{ \sf hydrogen}& \\ \dfrac{\qquad\qquad}{ \sf Cu}&\dfrac{\qquad\qquad}{ \sf copper }& \\ \dfrac{\qquad\qquad}{ \sf Ag}&\dfrac{\qquad\qquad}{ \sf silver}& \\ \dfrac{\qquad\qquad}{ \sf Au}&\dfrac{\qquad\qquad}{ \sf gold}& \\ \dfrac{\qquad\qquad}{ \sf Pt}&\dfrac{\qquad\qquad}{ \sf platinum }&\end{array}}\end{gathered}& \\ \end{gathered}\end{gathered}$