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3 years ago

A block of metal has a volume of 13.2 in3 and weighs 5.30 lb,What is its density in grams per cubic centimeter?

Chemistry

2 answers:

nydimaria [60]3 years ago

8 0

Density = Mass/Volume

d = 5.30/13.2

vovangra [49]3 years ago

5 0

Answer: The density of metal is $11.16g/cm^3$

Explanation:

To calculate volume of a substance, we use the equation:

$\text{Density of a substance}=\frac{\text{Mass of a substance}}{\text{Volume of a substance}}$

We are given:

Mass of metal = 5.30 lb = 2406.2 g (Conversion factor: 1 lb = 454 g)

Volume of metal = $13.2in^3=215.69cm^3$ (Conversion factor: $1in^3=16.34cm^3$ )

Putting values in above equation, we get:

$\text{Density of metal}=\frac{2406.2g}{215.69cm^3}\\\\\text{Density of metal}=11.16g/cm^3$

Hence, the density of metal is $11.16g/cm^3$

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What is the mole ratio between oxygen and carbon dioxide? C25H52 + 38 O2 → 25 CO2 + 26 H2O

user100 [1]

Answer:

38 : 25

Explanation:

First thing's first, we have to confirm if the reaction is indeed balanced.

The equation of the reaction is given as;

C25H52 + 38 O2 → 25 CO2 + 26 H2O

From the reaction, 38 moles of O2 produces 25 moles of CO2

The ratio is given as;

38 : 25

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3 years ago

Trans fats: Think about how the prefix trans- is used in naming alkenes.

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In an alkene, cis and trans isomers are possible because the double band is rigid, cannot rotate, has groups attached to the carbons of the double bond that are fixed relative to each other, and only occurs with double bonds-possibility that molecule will have different geometries; two different molecules with slightly different properties.
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While naming Cis-Trans isomers the prefix cis or trans are placed in front of the alkene name when there are cis-trans isomers.

4 0

3 years ago

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Ultraviolet radiation and radiation of shorter wavelengths can damage biological molecules because they carry enough energy to b

Lelechka [254]

Answer:

343.98 nm is the longest wavelength of radiation with enough energy to break carbon–carbon bonds.

Explanation:

A typical carbon–carbon bond requires 348 kJ/mol=348000 J/mol

Energy required to breakl sigle C-C bond:E

$E=\frac{348000 J/mol}{6.022\times 10^{23} mol^{-1}}=5.7788\times 10^{-19} J$

$E=\frac{h\times c}{\lambda}$

where,

E = energy of photon

h = Planck's constant = $6.626\times 10^{-34}Js$

c = speed of light = $3\times 10^8m/s$

$\lambda$ = wavelength of the radiation

Now put all the given values in the above formula, we get the energy of the photons.

$\lambda =\frac{(6.63\times 10^{-34}Js)\times (3\times 10^8m/s)}{5.7788\times 10^{-19} J}$

$\lambda =3.4398\\times 10^{-7}m=343.98 nm$

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3 years ago

Sodium chloride can be produced by the reaction of sodium metal with chlorine gas. Which is the limiting reactant if 6.70 moles

Alecsey [184]

Answer:

Chlorine gas.

Explanation:

Hello!

In this case, the undergoing chemical reaction is:

$2Na+Cl_2\rightarrow 2NaCl$

Thus, given the moles of reacting both sodium and chlorine, we compute the moles of sodium chloride yielded by each reactant by considering the 2:2 and 1:2 mole ratios:

$n_{NaCl}^{by\ Na}=6.70molNa*\frac{2molNaCl}{2molNa}=6.70molNaCl \\\\n_{NaCl}^{by\ Cl_2}=3.20molCl_2*\frac{2molNaCl}{1molCl_2}=6.40molNaCl$

Thus, since chlorine yields less moles of sodium chloride, we infer it is the limiting reactant.

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3 years ago

What is the name for the lowest layer of the atmosphere, which is most influenced by human activities?

bagirrra123 [75]

The Answer Is B Because You Have To Divide The 9

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4 years ago

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