All categories

2 years ago

The molarity of a 4.200 L solution is 1.230 M Na2CO3. What is the mass of Na2CO3

Chemistry

1 answer:

Lerok [7]2 years ago

7 0

Answer:

547.5g

Explanation:

To get the mass, you need moles.

moles = (molarity)(Liters)

moles = (1.230M)(4.200L) = 5.166 moles Na2CO3

Now, just use stoichiometry

molar mass of Na2CO3 = 2(mass of Na) + (mass of C) + 3(mass of O)

= 2(22.9) + 12.01 + 3(16) = 105.99g/mol

5.166moles(105.99g/mol)

= 547.544

But, the measurements given had 4 significant figures, so in chemistry we write:

547.5g

You might be interested in

Which has the highest viscory ? Milk ? Water ? Orange juice?

Snezhnost [94]

I guess you mean viscosity
Anyhow the answer is milk

5 0

2 years ago

What is the mass, in pounds, of 389 mL of a gas that has a density of 1.29 g/L?

devlian [24]

Answer: Mass of gas is 0.001 pounds.

Explanation:

Density is defined as the mass contained per unit volume.

$Density=\frac{mass}{Volume}$

Given : Mass of gas = ?

Density of gas = $1.29g/L$

Volume of gas = 389 ml = 0.389 L (1L=1000ml)

Putting in the values we get:

$1.29g/L=\frac{mass}{0.389L}$

$mass=0.5grams$

$mass=0.5\times 0.002lb=0.001lb$ (1g =0.002 lb)

Thus the mass of gas is 0.001 pounds.

7 0

2 years ago

Which of the following describes a covalent bond?

BaLLatris [955]

I think it is C, because a covalent bond is a distribution of 2 atoms to 1 electron, meaning they are sharing and not exchanging, and the electronegravity would be above 1.7

5 0

2 years ago

Read 2 more answers

What is true about protons within an atom?

Ira Lisetskai [31]

It defines the element. If you change the protons, you change the type of element. A proton is positively charged and is most of the mass of the atom, next to the neutron. Neutrons have a very very very slightly higher mass.

4 0

2 years ago

4 Weathering Assessment

alexira [117]

Answer:

This is an example of chemical change because the Kool aid dissolved and turned the water red

6 0

2 years ago