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2 years ago

Please help!! will give brainliest if u tell me how

Chemistry

1 answer:

Alona [7]2 years ago

8 0

I am pretty sure it’s A

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If 5g of H2 are reacted with excess CO, how many grams of CH3OH are produced, based on a yield of 86%?

Cerrena [4.2K]

Answer: 34.4 g

Explanation:

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

$\text{Number of moles of hydrogen}=\frac{5g}{2g/mol}=2.5moles$

As $CO$ is in excess, $H_2$ is the limiting reagent and thus it will limit the formation of products.

$CO+2H_2\rightarrow CH_3OH$

According to stoichiometry:

2 moles of hydrogen produce = 1 mole of $CH_3OH$

2.5 moles of hydrogen produce = $\frac{1}{2}\times 2.5=1.25 moles$ of $CH_3OH$

Mass of $CH_3OH=moles\times {\text {Molar mass}}=1.25\times 32=40g$

But as % yield is 86%, mass of $CH_3OH$ produded is $\frac{86}{100}\times 40=34.4g$

Thus 34.4 g of $CH_3OH$ is produced.

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3 years ago

Identify each example on the diagram as a carbon source or a carbon sink

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A boy weighing 25 kg sits in a 1000 kg car at a speed of 15 m/s. What is the total momentum of the car and the boy?

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D) 15375kgm/s

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weight of the boy 25kg +weight of the car 1000kg= 1025kg so momentum =mass × velocity. so it's SI unit is = kg×m/s = kg m/s.

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Hoped this helped in any way

Have a nice day

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3 years ago