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grin007 [14]
3 years ago
6

Calculate the density of helium if a balloon with a capacity of 5.00 L holds 0.890 g.

Chemistry
1 answer:
liubo4ka [24]3 years ago
5 0

Answer:

Explanation:

Density is m/V. Also, 1 liter = 1000 cm^3. So, we get 0.890/(5*1000) = 1.78*10^{-4} g/cm^3. You can convert this to kg/m^3 as well by multiplying it by 10. Depends which one you want.

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Hard water stains in sinks and showers can be caused by a buildup of solid calcium carbonate. These stains can be removed by bat
LiRa [457]

Answer:

CaCO3 + 2HCl ---> CaCl2 + H2O + CO2

Explanation:

The reaction between solid calcium carbonate and a mineral acid such as aqueous HCl is a neutralization reaction and occurs with the evolution of CO2 gas.

The balanced equation is given below

CaCO3 + 2HCl ---> CaCl2 + H20 + CO2

The product CaCl2 is water soluble which accounts for why the stain is removed, while CO2 gas escapes away from the reaction surface.

8 0
2 years ago
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A 17.98-g piece of iron absorbs 2056.5 joules of heat energy, and its temperature changes from 25°C to 200°C. Calculate the spec
V125BC [204]

Answer: 0.65\ J/g.^{\circ}C

Explanation:

Given

Mass of iron piece is m=17.98\ g

Heat absorbed Q=2056.5\ J

Temperature changes from 25^{\circ}C\ to\ 200^{\circ}C i.e.

\Delta T=200-25=175^{\circ}C

Heat absorbed is given by Q=mc\Delta T\quad [c=\text{specific heat of material}]

Insert the values

\Rightarrow 2056.5=17.98\times c\times 175\\\\\Rightarrow c=\dfrac{2056.5}{3146.5}\\\\\Rightarrow c=0.65\ J/g.^{\circ}C

Thus, the specific heat of iron is 0.65\ J/g.^{\circ}C

7 0
3 years ago
If a solution contains 3.00 moles of NaCl in 8.00 liters of water, what is the molarity?
ExtremeBDS [4]

Answer:

0.375 M

Explanation:

molarity = number of moles of solute/ number of L solution = 3.00 mol/8.00 L=

= 0.375 mol/L = 0.375 M

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Answer:

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