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3 years ago

Given the chemical reaction Fe3O4 + H2 ⟶ Fe + H2O, identify the coefficient of H2O in the balanced equation.

Chemistry

1 answer:

Nesterboy [21]3 years ago

6 0

Answer:

fe3o4+4h2 - 3fe + 4h2o

therefore coefficient is 4

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True or false. Fossils are the only type of evidence that supports the theory of

never [62]

Answer:

True

Explanation:

The evidence for evolution is found at all levels of organization in living things and in the extinct species we know about through fossils.

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2 years ago

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Limestone (CaCO3) is decomposed by heating to quicklime (CaO) and carbon dioxide. Calculate how many grams of quicklime can be p

Harman [31]

Answer: 2800 g

Explanation:

$CaCO_3(s)\rightarrow CaO(s)+CO_2(g)$

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number $6.023\times 10^{23}$ of particles.

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

Given mass = 5 kg = 5000 g

$\text{Number of moles}=\frac{5000g}{100g/mol}=50moles$

1 mole of $CaCO_3$ produces = 1 mole of $CaO$

50 moles of $CaCO_3$ produces = $\frac{1}{1}\times 50=50moles$ of $CaO$

Mass of $CaO=moles\times {\text{Molar mass}}=50moles\times 56g/mole=2800g$

2800 g of $CaO$ is produced from 5.0 kg of limestone.

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3 years ago

A hot air balloon can have a volume of 2950 cubic meters (2.95 ✕ 106 liters) and operate at temperatures up to 250°F (121°C). As

TiliK225 [7]

Answer:

2.64 × 10⁶ g

Explanation:

We can find the mass of air using the ideal gas equation.

$P.V=n.R.T=\frac{m}{M} .R.T$

where,

P is the pressure (P = 1.00 atm)

V is the volume (V = 2.95 × 10⁶ L)

n is the number of moles

R is the ideal gas constant (0.08206atm.L/mol.K)

T is the absolute temperature (121°C + 273 = 394 K)

m is the mass

M is the molar mass (28.09 g/mol)

$m=\frac{P.V.M}{R.T} =\frac{1.00atm \times 2.95 \times 10^{6} L \times 28.97g/mol}{(0.08206atm.L/mol.K) \times 394 K } =2.64 \times 10^{6} g$

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3 years ago

The height of mercury in a closed-end manometer is 655 mm and the atmospheric pressure is 760 mm Hg.

Olenka [21]

I don't understand

Explanation:

can u explain more

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3 years ago

I am 14 and i am in 8th grade, and i really like this boy in my science class, and i really wanna ask him out but i don't know i

Helga [31]

Answer:

just go up to him and express ur feelings, there is no harm for that.

Explanation:

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3 years ago

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