3 years ago

A mole of lead will be heavier than a mole of oxygen because

Chemistry

1 answer:

tatuchka [14]3 years ago

8 0

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True, it would slow down.

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The molality of a solution containing 8.1 moles of solute in 4,847 g of solvent is _____. 1.7m 598m 39m 0.17m

Hitman42 [59]

When molality = no.of moles of solute/weight Kg of solvent

and when we have the no. of moles of solute = 8.1 moles
and the weight Kg of the solvent =4847 g /1000 = 4.847 Kg
so by substitution :
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An independent variable is defines as the variable that is changed or controlled in a scientific experiment.

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How many grams of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel?

Nimfa-mama [501]

Answer: 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.

Explanation:

According to the dilution law,

$C_1w_1+C_2w_2=C_3w_3$

where,

$C_1$ = concentration of ist progesterone gel = 8%w/w

$w_1$ = weight of ist progesterone gel = x g

$C_2$ = concentration of another progesterone gel = 4% w/w

$w_2$ = weight of another progesterone gel = 1.45 g

$C_3$ = concentration of resulting progesterone gel = 5.5%w/w

$w_3$ = weight of resulting progesterone gel = (x+1.45) g

$8\times x+4\times 1.45=5.5\times (x+1.45)$

$x=0.87$

Thus 0.87 g of an 8% w/w progesterone gel must be mixed with 1.45 g of a 4% w/w progesterone gel to prepare a 5.5% w/w gel.

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aev [14]

I think that D is the correct answer
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