2 years ago

Please help this is very important

Chemistry

1 answer:

rosijanka [135]2 years ago

7 0

Answer:

Explanation:

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Consider 2H2 + O2 → 2H2O. To produce 1.2 g water, how many grams of H2 are required? Report to the correct number of significant

Elden [556K]

Answer:

0.133 mol (corrected to 3 sig.fig)

Explanation:

Take the atomic mass of H=1.0, and O=16.0,

no. of moles = mass / molar mass

so no. of moles of H2O produced = 1.2 / (1.0x2+16.0)

= 0.0666666 mol

From the equation, the mole ratio of H2:H2O = 2:2 = 1:1,

meaning every 1 mole of H2 reacted gives out 1 mole of water.

So, the no, of moles of H2 required should equal to the no, of moles of H2O produced, which is also 0.0666666 moles.

mass = no. of moles x molar mass

hence,

mass of H2 required = 0.066666666 x (1.0x2)

= 0.133 mol (corrected to 3 sig.fig)

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3 years ago

Pubhvcghbb<br> Jgyukbcu?

tino4ka555 [31]

Answer:

WHAT??

Explanation:

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3 years ago

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Why can Sirius be seen in the night sky?<br> Thank you who ever answers

ra1l [238]

Answer:

Because the star has a higher luminosity/intrinsic brightness than other stars.

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3 years ago

What is the ionic equation for HBr(aq) + NH3(aq)

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Complete equation, ionic equation, and net ionic equation for NH4C2H3O2(aq) + NH3 (aq)

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2 years ago

Las capas del lecho marino del Mar Mediterráneo cuentan la historia de los cambios ambientales en el hoy desértico norte de Afri

slamgirl [31]

Answer:

160.000 años corresponde a 16.000 décadas.

Explanation:

Para resolver correctamente el ejercicio debemos plantear la regla de tres simple de la siguiente manera:

1 década equivale a 10 años; A cuantas decadas equivalen 160.000 años?

1 década→10 años

x ←160.000 años

Debemos multiplicar 160.000 por 1 y luego dividir entre 10 ;

x=( $\frac{160.000x1}{10}$ )=16.000 décadas; en notación científica sería 16x10^3.

Respuesta: 160.000 años corresponde a 16.000 décadas.

5 0

3 years ago

Please help this is very important​

Please help this is very important