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son4ous [18]
3 years ago
13

When a mineral was heated in a Bunsen flame to constant mass, a colourless gas that turned lime water milky was evolved. The rem

aining solid was cooled and then added to aqueous hydrochloric acid. Vigorous effervescence was seen.
What was the mineral?


A aragonite, CaCO3

B artinite, MgCO3.Mg(OH)2.3H2O

C barytocalcite, BaCO3.CaCO3

D dolomite, CaCO3.MgCO3

Please Explain.
Chemistry
1 answer:
max2010maxim [7]3 years ago
6 0
Vigorous effervescence can be seen only in C
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How many grams of CaCl2
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Answer:

\boxed{\text{110.4 g of CaCl$_{2 }$ and 234.5 g of water}}

Explanation:

1. Mass of CaCl₂

\text{Let m = mass of CaCl}_{2}\\\\\begin{array}{rcl}\text{Mass percent} & = & \dfrac{\text{Mass of CaCl}_{2}}{\text{Total mass}} \times 100 \%\\\\32.0 \% & = & \dfrac{m}{\text{344.9 g}} \times 100 \% \\\\\text{32.0 $\times$ 344.9 g} & = & 100 m\\\\m & = &\dfrac{\text{32.0 $\times$ 344.9 g}}{100}\\\\ & = &\textbf{110.4 g}\\\end{array}\\\text{You need $\boxed{\textbf{110.4 g}}$ of calcium chloride}

2. Mass of water

\text{Let m = mass of water}\\\begin{array}{rcl}\\\text{Mass of water + mass of CaCl}_{2} & = & \text{Mass of solution}\\m + 110.4 & = & 344.9\\m & = &\mathbf{234.5}\\\end{array}\\\text{The mass of water needed is $\boxed{\textbf{234.5 g}}$}

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Does prokaryotes have DNA
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Which planet in are solar system haves most moons
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Explanation:

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If 60.0 grams of carbonic acid are sealed in a 2.00 L soda bottle at room temperature (298 K) and decompose completely via the e
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Answer:

The final pressure of the carbon dioxide gas will 11.84 atm.

Explanation:

Moles of carbonic acid = \frac{60.0 g}{62 g/mol}=0.9677 mol

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According to reaction, 1 mol of carbonic acid gives 1 mole of carbon dioxide gas.

Then 0.9677 moles of carbonic acid will give :

\frac{1}{1}\times 0.9677 mol=0.09677 mol of carbon dioxide

Moles of carbon dioxide gas = n = 0.09677 mol

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Pressure of the carbon dioxide gas = P

Temperature of the carbon dioxide gas = T = 298 K

PV=nRT (ideal gas law)

P=\frac{nRT}{V}=\frac{0.9677 mol\times 0.0821 atm L/mol K\times 298 K}{2 L}=11.84 atm

The final pressure of the carbon dioxide gas will 11.84 atm.

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