All categories

3 years ago

How many grams of sodium bromide must be dissolved in 400.0 g of water to produce a 0.500 molar solution?

Chemistry

1 answer:

kiruha [24]3 years ago

8 0

Answer:

D. 20.6g

Explanation:

Molarity is defined as ratio between moles of solute (sodium bromide, NaBr) per liter of water.

As density of water is 1g/mL; volume of 400.0g of water is 400.0mL = 0.4000L.

That means 0.400L of 0.500M solution contains:

0.400L × (0.500mol / 1L) = <em>0.200moles of sodium bromide</em>.

In mass (NaBr = 102.9g/mol):

0.200mol NaBr × (102.9g/mol) = 20.6g of NaBr

Right answer is:

You might be interested in

Which of the following represents the atoms of 2 different elements?

Marrrta [24]

Answer:

Explanation:

7 0

2 years ago

A pet owner dropped some new fish into a pond. Several species of fish lived in the pond, but within a few months, only members

Daniel [21]

Answer: the correct answer is : too many fish caused an imbalance in the ecosystem, so the food web was affected.

Explanation:

8 0

3 years ago

How many moles are there in 3.612 x 1024 formula units of Na2SO4?

vitfil [10]

Answer:

<h3>Theanswer is 6 moles</h3>

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

$n = \frac{N}{L} \\$

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

$n = \frac{3.612 \times {10}^{24} }{6.02 \times {10}^{23} } \\$

We have the final answer as

<h3>6 moles</h3>

Hope this helps you

5 0

3 years ago

How is Carbon returned to the atmosphere<br><br>Please help image below

Harrizon [31]

Answer:

Carbon is released back into the atmosphere when organisms die, volcanoes erupt, fires blaze, fossil fuels are burned, and through a variety of other mechanisms.Humans play a major role in the carbon cycle through activities such as the burning of fossil fuels or land development.

8 0

2 years ago

Read 2 more answers

Suppose an egyptian mummy is discovered in which the amount of carbon-14 present is only about oneone-fifthfifth the amount fo

poizon [28]

We are given the following equation:

y = y0 e^-0.0001216 t

where y = 1/5 y0, y0 is the original amount

So solving for time t:

1/5 y0= y0 e^-0.0001216 t

t = 13,235.51 years

So the human died about 13235.5 years ago

3 0

3 years ago