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3 years ago

What is the potential energy of 4kg object sitting on a 3m ledge?

Chemistry

1 answer:

bagirrra123 [75]3 years ago

6 0

Potential energy (Pe) = m*g*h

m = 4 kg
g = 10 m/s²
h = 3 m

And now:

Pe = 4*10*3

Pe = 120 Joules ou J

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How many moles in 28 grams of UO2?

Lina20 [59]

0.22 moles.

28 divided by 124 =0.22

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2 years ago

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

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2 years ago

Heating 2.40 g of the oxide of metal X (molar mass of X = 55.9 g/mol) in carbon monoxide (CO) yields the pure metal and carbon d

Korolek [52]

Answer:The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

Explanation:

Let the molecular formula of the oxide of metal be $X_2O_y$

$X_2O_y+yCO\rightarrrow yCO_2+2X$

Mass of metal product = 1.68 g

Moles of metal X = $\frac{1.68 g}{55.9 g/mol}=0.03005 mol$

1 mol of metal oxide produces 2 moles of metal X.

Then 0.03005 moles of metal X will be produced by:

$\frac{1}{2}\times 0.03005 mol=0.01502 mol$ of metal oxide

Mass of 0.01502 mol of metal oxide = 2.40 g (given)

$0.01502 mol\times (2\times 55.9 g/mol+y\times 16 g/mol)=2.40 g$

y = 2.999 ≈ 3

The molecular formula of the oxide of metal be $X_2O_3$ . The balanced equation for the reaction is given by:

$X_2O_3+3CO\rightarrow 3CO_2+2X$

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