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2 years ago

Which description below represents a hydrocarbon?

Chemistry

1 answer:

pantera1 [17]2 years ago

8 0

The answer is A, an organic compound that contains only carbon and hydrogen atoms

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Triethylenemelamine is used in the plastics industry and as an anticancer drug. Its analysis is 52.93% carbon, 5.92 % hydrogen,

patriot [66]

Assuming total mass to be 100 g

Mass of C = 52.93 g

=> Moles of C = $52.93 g *\frac{1 mol}{12gC} =4.41 mol C$

Mass of H = 5.92 g

=> Moles of H= $5.92g*\frac{1mol}{1.01g}=5.86molH$

Mass of N = 41.15 g

=>Moles of N= $41.15g*\frac{1 mol}{14 g}=2.94mol N$

Simplest mole ratio of the atoms in the compound:

$C_{\frac{4.41mol}{2.94mol} } H_{\frac{5.86mol}{2.94mol} }N_{\frac{2.94mol}{2.94mol} } =C_{1.5}H_{2}N_{1} or(C_{1.5}H_{2}N_{1})_{2}=>C_{3}H_{4}N_{2}$

Empirical formula mass= $(3*12)+(4*1.01)+(2*14)=68.04g$

Multiple n = $\frac{204.2}{68.04}=3$

Molecular formula= $(Empirical formula)_{n} =(C_{3}H_{4}N_{2})_{3}=C_{9}H_{12}N_{6}$

6 0

2 years ago

Chlorine can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid, HCl(aq)HCl(aq), as descr

ra1l [238]

Answer: 0.887 g of $MnO_2$ should be added to excess HCl(aq).

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 805 torr = 1.06 atm (760torr=1atm)

V = Volume of gas = 235 ml = 0.235 L

n = number of moles = ?

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $25^0C=(25+273)K=298K$

$n=\frac{PV}{RT}$

$n=\frac{1.06atm\times 0.235L}{0.0820 L atm/K mol\times 298K}=0.0102moles$

$MnO_2(s)+4HCl(aq)\rightarrow MnCl_2(aq)+2H_2O(l)+Cl_2(g)$

According to stoichiometry:

1 mole of chlorine is produced by = 1 mole of $MnO_2$

Thus 0.0102 moles of chlorine is produced by = $\frac{1}{1}\times 0.0102=0.0102$ moles of $MnO_2$

Mass of $MnO_2$ = $moles\times {\text {Molar mass}}=0.0102mol\times 87g/mol=0.887g$

0.887 g of $MnO_2$ should be added to excess HCl(aq).

7 0

2 years ago

A person loses 2.70 lb in two weeks. how many grams did they lose?

leonid [27]

Answer:

1224.7

Explanation:

Each lb is 453.59

6 0

2 years ago

The picture shows two cars moving at the same speed. Which car has more kinetic energy?

kati45 [8]

Answer:

car 2/red

Explanation:

give me crown

7 0

2 years ago

If oxygen at 128 kpa is allowed to expand at constant temp until it's pressure is 101.3 kpa how much larger will the volume beco

LenaWriter [7]

which means that the volume increased by 26.4 mL in order to compensate for the decrease in pressure.

Like I said, depends on what your initial volume was, but that's how you think of it.

Hope this helped!

6 0

2 years ago