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3 years ago

How many grams of Br are in 345g of CaBr2?

Chemistry

1 answer:

nadya68 [22]3 years ago

4 0

Answer:

276g of Br are present

Explanation:

To solve this question we need to find the moles of CaBr2 using its molar mass -CaBr2: 199.89g/mol-. As 1 mole of CaBr2 contains 2 moles of Br we can find the moles of Br and its mass:

Moles CaBr2:

345g * (1mol/199.89g) = 1.7259 moles CaBr2

Moles Br:

1.7259 moles CaBr2 * (2mol Br / 1mol CaBr2) = 3.4519 moles Br

Mass Br -Molar mass: 79.904g/mol-

3.4519 moles Br * (79.904g/mol) = 276g of Br are present

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ella [17]

Answer:

A 71 kg person will get a BAC of 0.05 when drinking 0.3442 L of beer

Explanation:

The mass of blood in a human body is approximately 8%, so if a person weighs 71 kg, the mass of blood would be:

71 kg * 8/100 = 5.68 kg of blood.

Using blood density, we can calculate the volume that 5.68 kg of blood occupies:

5.68 kg * $\frac{1m^{3}}{1025kg}$ = 0.0055415 m³

We convert m³ into mL, keeping the unit that we want to convert to in the numerator; and the unit that we want to convert in the denominator:

$0.0055415m^{3}*\frac{1000L}{1m^{3}} *\frac{1000mL}{1L}=5541.5mL$

Now we calculate the amount of alcohol that would be needed in the bloodstream to get a BAC of 0.05:

$\frac{5541.5mL}{100mL}*0.05g$ = 2.77 g of alcohol are needed in the bloodstream in order to have a BAC of 0.05

The amount of alcohol that needs to be ingested is higher than 2.77 g, due to the fact that only 17% of the alcohol goes into the bloodstream, so:

2.77 g $*\frac{100}{17} =$ 16.29 g of alcohol need to be ingested

Then we use the alcohol concentration of beer to calculate the volume of beer needed, using the alcohol density. First we convert the alcohol density to g/L, making sure the units that we want to convert cancel each other:

$789\frac{kg}{m^{3}}*\frac{1000g}{1kg} *\frac{1m^{3}}{1000L} =789g/L$

Now we use the density to calculate the litres of alcohol needed, keeping in mind that 16.29 g of alcohol are needed:

$16.29g*\frac{1L}{789g}=$ 0.02065 L of alcohol are needed.

Finally we calculate the litres of beer needed, keeping in mind the concentration of alcohol in beer:

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3 years ago

when aqueous solutions of table salt and silver nitrate are mixed a white solid forms. this solid is____?

elena55 [62]

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4 years ago

2 and 3 i need help with. look at the attatched picture

snow_lady [41]

Answer:

2. +7

Explanation:

The oxidation state of Cl in `HClO_(4)` is +7.Apr 17, 2022

3ans. CrS+2No3 --) 2No+So4+cr^3+

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S=1 S=1

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now that is how it look and it is not balanced in oxygen so add 2 in the front of No3.

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so now it is blance.

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2 years ago

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As the volume increases, there is more space so the average distance between the gas molecules also increases.

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4 years ago

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