To find the mass percent composition of an element, divide the mass contribution of the element by the total molecular mass. This number must then be multiplied by 100% to be expressed as a percent.

3 0

3 years ago

Which word means the remains or imprints of once-living organisms found in layers of rock

Lerok [7]

Fossils is the answer

5 0

3 years ago

Please choose the correct sequence that describes the excitement of an atom.

Angelina_Jolie [31]

Answer: A because it’s correct

7 0

3 years ago

A Rolaids tablet contains calcium for neutralizing stomach acid. if a Rolaids tablet neutralizes 24.65ml of 0.547m hydrochloric

Lelu [443]

There are 674 mg of calcium carbonate in a Rolaids tablet

<h3>Further explanation</h3>

Reaction

CaCO₃ + 2HCl ⇒ CaCl₂ + CO₂ +H₂O

V HCl = 24.65 ml

M HCl = 0.547

mol HCl :

$\tt 24.65\times 0.547=13.48~mlmol$

ratio mol CaCO₃ : HCl = 1 : 2, so mol CaCO₃ :

$\tt \dfrac{1}{2}\times 13.48=6.74~mlmol=6.74\times 10^{-3}~mol$

mass of CaCO₃ (MW=100~g/mol) :

$\tt 6.74\times 10^{-3}\times 100=0.674~g=674~mg$

4 0

3 years ago