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spin [16.1K]
3 years ago
10

How many atoms in: 1. PbF3 - 2. Pb2O3 -

Chemistry
1 answer:
Gre4nikov [31]3 years ago
3 0

Answer:

The correct answer is 1) 257 and 2) 135

Explanation:

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What forms white light?
leva [86]

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Combination of all the wavelengths of visible light.

Explanation:

Hope it helps you :))))

Have a good day

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2 years ago
Need help guys!!!!
Serhud [2]
A. When two chemicals mix their temperature rise: <span>Exothermic
b. </span>A solid burns brightly and releases heat, light and sound: <span>Exothermic
c. </span>When two chemicals are mixed their temperature drops: <span>Endothermic
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e. </span>Plants take in light energy for photosynthesis: <span>Endothermic

I hope this helps :)</span>
4 0
4 years ago
If a substance can not be seperated physically it is ______________.
anyanavicka [17]
A pure substance I say
5 0
3 years ago
How many grams of a 19.6% sugar solution contain 72.5 g of sugar?
anzhelika [568]

Answer:

6.2g of sugar solution contains 72.5g

4 0
3 years ago
Two linear hydrocarbons, Hexane (C6H14) and Heptane (C7H16), form pretty much an ideal solution at any composition. A solution i
Anettt [7]

Answer:

y_{C_6H_{14}}=0.92

Explanation:

Hello,

At first, we compute liquid-phase molar fractions:

n_{C_6H_{14}}=463.96 g*\frac{1mol}{86g} =5.3949molC_6H_{14}\\n_{C_7H_{16}}=667.71 g*\frac{1mol}{100g} =6.6771molC_7H_{16}\\x_{C_6H_{14}}=\frac{5.3949}{5.3949+6.6771} =0.447\\x_{C_7H_{16}}=1-x_{C_6H_{14}}=0.553

Now, by means of the fugacity concept, for hexane, for instance, we have:

f_{C_6H_{14}}^V=f_{C_6H_{14}}^L\\y_{C_6H_{14}}p_T=x_{C_6H_{14}}p_{C_6H_{14}}

In this manner, at 25 °C the vapor pressure of hexane and heptane are 0.198946 atm and 0.013912 atm repectively, thus, the total pressure is:

p_T=x_{C_6H_{14}}p_{C_6H_{14}}+x_{C_7H_{16}}p_{C_7H_{16}}\\p_T=0.447*0.198946 atm +0.553*0.013912 atm=0.096622atm

Finally, from the hexane's fugacity equation, we find its mole fraction in the vapour as:

y_{C_6H_{14}}=\frac{x_{C_6H_{14}}p_{C_6H_{14}}}{p_T}=\frac{0.447*0.198946 atm}{0.096622atm} \\y_{C_6H_{14}}=0.92

Best regards.

3 0
3 years ago
Read 2 more answers
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