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4 years ago

Which describes 5 molecules of water? 1. 2 H2O 2. H2O3 3. 5 H2O

Chemistry

1 answer:

Phantasy [73]4 years ago

5 0

Answer:

Water is a chemical compound and polar molecule, which is liquid at standard temperature and pressure. It has the chemical formula H2O, meaning that one molecule of water is composed of two hydrogen atoms and one oxygen atom.

Explanation:

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Theoretically, a student performing a lab experiment was expected to get 9 g of product. Instead, the student obtained only 7.8

vichka [17]

We are given with a theoretical amount of 9 grams of product but the student only got 7.8 grams. To calculate the percent yield, we divide the experimental amount by the theoretical amount. In this case, we divide 7.8 grams by 9 grams and multiply by 100 percent. The answer is equal to 86.67 percent.

7 0

4 years ago

Suppose while walking along the beach, you find a green crystal. Which properties could you use to determine whether the crystal

baherus [9]

Explanation:

Emerald is defined by its green color. To be an emerald, a specimen must have a distinctly green color that falls in the range from bluish green to green to slightly yellowish green. To be an emerald, the specimen must also have a rich color.

5 0

3 years ago

A 2.60 gram sample of a compound know to contain only indium and chlorine is dissolved in 50.0 g of tin(IV) chloride (Kb = 9.43o

Alexxx [7]

Answer: 1. The molecular weight of the compound is 222.8 g/mol

2. The probable molecular formula of the solute is $InCl_3$

Explanation:

Elevation in boiling point is given by:

$\Delta T_b=i\times K_f\times m$

$\Delta T_b=T_b-T_b^0=(116.3-114.1)^0C=2.2^0C$ = elevation in boiling point

i= vant hoff factor = 1 (for non electrolyte)

$K_b$ = boiling point constant = $9.43^0Ckg/mol$

m= molality

$\Delta T_b=i\times K_b\times \frac{\text{mass of solute}}{\text{molar mass of solute}\times \text{weight of solvent in kg}}$

Weight of solvent (tin chloride)= 50.0 g =0.05 kg

Molar mass of unknown solute = M g/mol

Mass of unknown solute = 2.6 g

$2.2=1\times 9.43\times \frac{2.6g}{M g/mol\times 0.05kg}$

$M=222.8g/mol$

The possible formula for the compound would be $InCl_3$ as indium has valency of 3 and chlorine has valency of 1 has molecular mass almost equal to 222.8.

4 0

3 years ago

A cylinder and piston assembly (defined as the system) is warmed by an external flame. The contents of the cylinder expand, doin

LiRa [457]

Answer:

The energy change for the given system: ΔE = 45 J

Explanation:

According to the First Law of thermodynamics, the energy can't be created or destroyed and can only be converted into other forms.

ΔE = Q - W ......equation 1

Given: ΔE is the change in the internal energy

Q is the heat absorbed by the system

W is the work done by the system

Given: Q = = 533 J, W = 488 J, ΔE = ?

Using equation 1, to calculate the change is the internal energy (ΔE),

ΔE = Q - W = 533 J - 488 J = 45 J

Therefore, the energy change for the given system: ΔE = 45 J

4 0

3 years ago

calculate and compare the chemical energy of coal to its gravitational potential energy. Burning 1 kg of coal releases about 3 m

Ksenya-84 [330]

Answer:

Explanation:

chemical energy of 1 kg coal is 3 million joules .

If this energy is used to lift one kg of coal , let height attained be h

chemical energy = gravitational energy of 1 kg of coal

3 x 10⁶ = m g h = 1 x 10 x h

h = 3 x 10⁵ m

= 300 x 10³ m

= 300 km .

i kg coal can be lifted by height of 300 km .

6 0

4 years ago