All categories

2 years ago

How many moles of calcium atoms are in 77.4g of Ca?

Chemistry

1 answer:

lina2011 [118]2 years ago

6 0

Answer:

1.93 mol Ca

Explanation:

Use Calcium's molar mass to convert g of Ca into mol of Ca.

You might be interested in

According to the reaction below, what mass of oxygen gas is required to produce 22 g of carbon dioxide?

alisha [4.7K]

The answer is B)4.0g

6 0

3 years ago

1826.5g of methanol (CH3OH), molar mass = 32.0 g/mol is added to 735 g of water, what is the molality of the methane 0.0348 m 1.

Snowcat [4.5K]

Answer:

Molality = 1.13 m

Explanation:

Molality is defined as the moles of the solute present in 1 kilogram of the solvent.

Given that:

Mass of $CH_3OH$ = 26.5 g

Molar mass of $CH_3OH$ = 32.04 g/mol

The formula for the calculation of moles is shown below:

$moles = \frac{Mass\ taken}{Molar\ mass}$

Thus,

$Moles= \frac{26.5\ g}{32.04\ g/mol}$

$Moles\ of\ CH_3OH= 0.8271\ moles$

Mass of water = 735 g = 0.735 kg ( 1 g = 0.001 kg )

So, molality is:

$m=\frac {0.8271\ moles}{0.735\ kg}$

<u>Molality = 1.13 m</u>

4 0

3 years ago

How much states have in united states

Gemiola [76]

Answer:

there are 50 states in the United States

Explanation:

you look at a map and count after that you count Alaska and Hawaii and you have 50

states

8 0

3 years ago

Read 2 more answers

const2013 [10]

$\huge{ \mathrm{ \underline{ Answer }\: \: ✓ }}$

The relationship between mass of matter per unit volume is known as :

$\large \boxed{ \mathrm{density}}$

_____________________________

$\mathrm{ ☠ \: TeeNForeveR \:☠ }$

8 0

2 years ago

What volume of 7.25 mol/L stock solution in needed to make 3.84 L of 8.50 mol/L solution?

Serjik [45]

Answer:

4.50 L

Explanation:

First we <u>calculate how many moles are there in 3.84 L of a 8.50 mol/L solution</u>:

3.84 L * 8.50 mol/L = 32.64 mol

Now, keeping in mind that

Concentration = Mol / Volume

we can calculate the volume of a 7.25 mol/L solution that would contain 32.64 moles:

Volume = Mol / Concentration

Volume = 32.64 mol ÷ 7.25 mol/L

Volume = 4.50 L

So we could take 4.50 L of the 7.25 mol/L solution and evaporate the solvent until only 3.84 L remain.

7 0

2 years ago