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3 years ago

Net ionic equations for potassium sulfate plus calcium phosphate yields

1 answer:

4 0

Balanced chemical reaction:
3K₂SO₄(aq) + Ca₃(PO₄)₂(s) → 2K₃PO₄(aq) + 3CaSO₄(s).
Ionic reaction:
6K⁺(aq) + 3SO₄²⁻(aq) + Ca₃(PO₄)₂(s) → 6K⁺(aq) + 2PO₄³⁻(aq) + 3CaSO₄(s).
Net ionic reaction: 3SO₄²⁻(aq) + Ca₃(PO₄)₂(s) → 2PO₄³⁻(aq) + 3CaSO₄(s).
aq(aqueous) means dissolved in water.
s(solid) means that salt not dissolved in water.
This chemical reaction is double displacement reaction - cations and anions of the two reactants switch places and form two new compounds.

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2 years ago

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A mixture contains NaHCO3 together with unreactive components. A 1.75 g sample of the mixture reacts with HA to produce 0.561 g

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$\%NaHCO_3=61.2\%$

Explanation:

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In this case, since the undergoing chemical reaction is only between the sodium bicarbonate and the acid HA:

$NaHCO_3+HA\rightarrow NaA+H_2O+CO_2$

For 0.561 g of yielded carbon dioxide (molar mass 44 g/mol), the following mass of sodium bicarbonate (molar mass 84 g/mol) that reacted was:

$m_{NaHCO_3}=0.561gCO_2*\frac{1molCO_2}{44gCO_2} *\frac{1molNaHCO_3}{1molCO_2} *\frac{84gNaHCO_3}{1molNaHCO_3} \\\\m_{NaHCO_3}=1.071g$

Considering the 1:1 mole ratio between CO2 and NaHCO3. Finally, the percent by mass of NaHCO3 is computed by dividing the mass of reacted NaHCO3 and t the mixture:

$\%NaHCO_3=\frac{1.071g}{1.75g}*100\%\\ \\\%NaHCO_3=61.2\%$

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3 years ago

The distance from the Moon to Earth is 5.46 * 108 km. How long does it take a laser need to travel between the moon and earth?

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Answer:

B. 1.82(10³) seconds (1820 seconds)

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Speed of Light: 3.00(10⁸) m/s or 3.00(10⁵) km/s

We know the distance from the Moon to Earth as 5.46(10⁸) km

We simply divide the distance by the speed of light:

$\frac{5.46(10^8)}{3.00(10^5)}$

We should get 1820 seconds or B. 1.82(10³) as our answer.

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3 years ago