The temperature of a gas is 100 K and its volume is 500.0 ml. If the volume increases to 1,000.0 ml,

The molar mass of sucrose (C12H22O11) is 342.3 g/mol. A chemist has a 0.500-mol sample of sucrose. What is the mass, in grams, o

Kryger [21]

Answer:

a) 171

Explanation:

We can find the mass (in grams) of a sample by multiplying the amount of moles by the molar mass.

In this case, we know we have 0.500-mol and would multiply it by the molar mass, 342.3g/mol, to give us the answer of 171.15g rounded down to 171g.

Equation: 0.500mol x 342.3g/mol = 171.15g

6 0

3 years ago

1. Mercury is most often obtained by roasting cinnabar (HgS). How many grams of cinnabar

Flauer [41]

Answer:

191.4 grams of cinnabar are required to obtain 165 grams of mercury.

Explanation:

The balanced reaction is:

HgS + O₂ ⇒ Hg + SO₂

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

HgS: 1 mole
O₂: 1 mole
Hg: 1 mole
SO₂: 1 mole

Being the molar mass of each compound:

HgS: 232g/mole
O₂: 32 g/mole
Hg: 200 g/mole
SO₂: 64 g/mole

the following mass amounts of each compound participate in the reaction:

HgS: 1 mole* 232 g/mole= 232 g
O₂: 1 mole* 32 g/mole= 32 g
Hg: 1 mole* 200 g/mole= 200 g
SO₂: 1 mole* 64 g/mole= 64 g

Then you can apply the following rule of three: if by stoichiometry 200 grams of Hg are formed from 232 grams of HgS , 165 grams of Hg are formed from how many grams of HgS?

$mass of HgS=\frac{165 grams of Hg*232 grams of HgS}{200 grams of Hg }$

mass of HgS= 191.4 grams

191.4 grams of cinnabar are required to obtain 165 grams of mercury.

5 0

3 years ago

In a research project, a scientist adds 0.1 mole of HCN, 0.1 mole of H3O , and 0.1mole of CN- to water to make a total volume of

Dovator [93]

Answer:

Reverse; since the value of Q is greater than the value of K

Explanation:

The equation for the reaction can be expressed as:

$HCN + H_2 O$ ⇄ $H_3O^+ +CN^{-}$ $k_a = 6.2 * 10^ {-10$

$Q = \frac{[H_3O^+][CN^-]}{[HCN]}$

$Q = \frac{(0.1)(0.1)}{(0.1)}$

Q = 0.1

$k_a = 6.2 * 10^ {-10$

Q > $K_{a}$

If the value of Q is greater than $K_{a}$ Value; the reaction will definitely shift to reverse direction.

6 0

4 years ago

Vegetable oil has the density of .92 g/mL and honey has the density of 1.42 g/mL. Which liquid will float?

Valentin [98]

If you are saying float in water, than it is vegetable oil, as it has a lower density, in other ways lighter than water, so it will float if it is poured onto water. Honey has a higher density than water and way higher density than vegetable oil, therefore being heavier and more dense it will go down to the bottom.

5 0

3 years ago

What is the product of the reaction? Please answer with the correct answer! Thanks.

arlik [135]

Answer:

compound

Explanation:

it is calcium oxide, also known as quicklime

7 0

3 years ago