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4 years ago

14 points!! Which of the following is the best reference point for describing the motion of the planets in our solar system?

Chemistry

1 answer:

BartSMP [9]4 years ago

3 0

Answer:

I think letter b? Dont count on it :) like is the question asking what can be an equivalent to the motion of our planets?

Explanation:

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I have the question How many moles of CaO are produced as 0.248 moles of CaCO3 (s) is heated?

IRISSAK [1]

Moles are mass/Mr
or Concentrate × Volume in order to find the mole of CaO u need to find the mole of CO2 and take it away from CaCO3

7 0

3 years ago

Read 2 more answers

Phosphorus trichloride gas and chlorine gas react to form phosphorus pentachloride gas. pcl3(g) + cl2(g) equilibrium reaction ar

vladimir1956 [14]

The question is incomplete, here is the complete question:

Phosphorus trichloride gas and chlorine gas react to form phosphorus pentachloride gas:

$PCl_3(g)+Cl_2(g)\rightleftharpoons PCl_5(g)$

A gas vessel is charged with a mixture of $PCl_3(g)$ and $Cl_2(g)$ , which is allowed to equilibriate at 450 K. At equilibrium the partial pressures of the three gases are $p_{PCl_3(g)}$ = 0.126 atm , $p_{Cl_2(g)}$ = 0.156 atm , and $p_{PCl_5(g)}$ = 1.60 atm. What is the value of $K_p$ at this temperature?

Answer: The $K_p$ for the given reaction is 81.4

Explanation:

For the given chemical equation:

$PCl_3(g)+Cl_2(g)\rightleftharpoons PCl_5(g)$

The expression of $K_p$ for above reaction follows:

$K_p=\frac{p_{PCl_5}}{p_{Cl_2}\times p_{PCl_3}}$

We are given:

$p_{PCl_5}=1.60atm\\p_{PCl_3}=0.126atm\\p_{Cl_2}=0.156atm$

Putting values in above equation, we get:

$K_p=\frac{1.60}{0.156\times 0.126}\\\\K_p=81.4$

Hence, the $K_p$ for the given reaction is 81.4

8 0

3 years ago

A gaseous hydrogen and carbon containing compound is decomposed and formed to contain 82.66% carbon and 17.34% hydrogen by mass.

Romashka [77]

Explanation:

Mole percentage of carbon = $\frac{percentage given}{molar mass of carbon}$

= $\frac{82.66}{12}$

= 6.89

Mole percentage of hydrogen = $\frac{percentage given}{molar mass of hydrogen}$

= $\frac{17.34}{1}$

= 17.34

Now, dividing mole percentage of both the atoms by 6.89.

Then, C = 1 and H = $\frac{17.34}{6.89}$ = 2.5

Hence, empirical formula is $C_{2}H_{5}$ .

As, it is given that P = 556 mm Hg. Convert mm Hg into atm as follows.

$\frac{556 mm Hg \times atm}{760 mm Hg}$

= 0.7316 atm

Volume is given as 158 mL. So, in liter volume is $\frac{158}{1000}$ equals 0.158 L.

According to ideal gas equation, PV = nRT

$0.7316 atm \times 0.158 L = \frac{mass}{molar mass} \times 0.082 atm L/mol K \times 298 K$

$0.7316 atm \times 0.158 L = \frac{0.275 g}{molar mass} \times 0.082 atm L/mol K \times 298 K$

molar mass = 58.2 g

Hence, molecular weight of $C_{2}H_{5}$ is $12 \times 2 + 5$ = 29.

Therefore, $(C_{2}H_{5})_{n}$ = 58

29 × n = 58

n = 2

Thus, molecular formula of the compound is $C_{4}H_{10}$ .

8 0

4 years ago

What is the sum of protons and neutrons in an atomic nucleus?

Alexxandr [17]

The sum of protons and neutrons in an atomic nucleus would be the MASS NUMBER.

3 0

3 years ago

Read 2 more answers

Burning wool smells like burning hair while burning cotton smells like burning paper. why?

julsineya [31]

Cotton is a plant product and paper is also made from plants. So when cotton is burnt, it smells like burning paper. While wool and hair both are from animals, hence on burning they smell similar.

8 0

4 years ago