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3 years ago

Please help asap!!

Chemistry

2 answers:

labwork [276]3 years ago

4 0

B) 120 cg/mL , because 1g = 100cg and 1L = 1000mL

rewona [7]3 years ago

4 0

Answer:

B. 120 cg/ ml

Explanation:

<u><em>If a liquid has a density of 1,200 g/L, what is its density in cg/mL?</em></u>

To fin this, we will simply use the idea of proportion. But first we need to know the number of gram per liter in 1 centigram per milliliter. Thus;

Let x = density of liquid in cg/ ml

1 cg/ml = 10 g/l

x = 1,200 g/l

cross- multiply

10x = 1,200

Divide both-side of the equation by 10 to get the value of x

10x/10 = 1,200/10

(At the left-hand side of the equation, 10 on the numerator will cancel-out 10 on the denomination and we will be left with just x, while on the right-hand side of the equation, 1200 will be divided by 1200)

x = 1,200/10

x =120 cg/ml

Therefore, the density of the liquid is 120 cg/ml

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If you react 2.00 g of hydrogen completely using 15.87 g of oxygen to produce water, how much water (in grams) will you have?

leonid [27]

Answer:

The amount (mass) of water we will have is 17.869 grams

Explanation:

The molar mass of hydrogen gas H₂ = 2.016 grams/mole

The molar mass of oxygen gas = 31.999 g/mol

Therefore, 2.00 g of hydrogen will give;

2.00/2.016 = 0.9921 moles of H₂ gas and

15.87 g of O₂ will give;

15.87/31.999 = 0.49595 moles

The reaction is as follows;

2H₂ (g) + O₂ (g) → 2H₂O (l)

Two moles of H₂ react with one mole of O₂ to produce two moles of H₂O

Therefore 0.9921 moles of H₂ will react with 0.9921/2 or 0.49595 moles of O₂ to produce 0.9921 moles of H₂O

From the above we note that all the H₂ and O₂ are completely consumed to form 0.9921 moles of H₂O

Molar mass of H₂O = 18.01528 g/mol

Number of moles = Mass/(Molar mass)

∴ Mass of H₂O = (Molar mass) × (Number of moles)

= 18.01528 g/mol × 0.9921 moles = 17.869 grams

Therefore the amount (mass) of water we will have = 17.869 grams.

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sattari [20]

Answer:

<h2>9.00 moles</h2>

Explanation:

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From the question we have

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We have the final answer as

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