How many molecules of glucose are in a 2.0 mL of a 1.02 mM solution of glucose

Answers

Answer 1

Answer: One way of expressing concentration is by molarity. It is the amount of solute per unit volume of the solution. Usually, it takes the unit mol/L. The calculation for this problem is as follows:

1.02 mM = (1.02 mol / mL) (2.0 mL) = 2.04 mol

Thus, the solution has 2.04 mol of glucose.

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Under which conditions of temperate and pressure does oxygen gas behave least like an ideal gas

Answers

Under extremely high pressure and extremely low temperature. This is because part of the requirements of an ideal gas is that the atoms/molecules don't interact which brakes down at low temperatures and the atoms/molecules are point masses that have insignificant volumes compared to the volume the gas is in which breaks down at high pressures.

In an experiment, 12.0 dm3 of oxygen, measured under room conditions, is used to burn completely 0.10 mol of propan-1-ol. What is the final volume of gas, measured under room conditions? A 7.20 dm3 B 8.40 dm3 C 16.8 dm3 D 18.00 dm3

Answers

The chemical reaction is

C3H8O + (9/2) O2 = 3CO2 + 4H2O

Theoretical amount of oxygen needed = 0.1 mol of propanol ( 4.5 mol O2 / 1 mol propanol) = 0.45 mol

The amount of oxygen used in mol can be calculated using the ideal gas equation

PV = nRT

@room conditions

P = 1 atm

T = 25C ~ 298 K

R = 0.08205 mol – L/ atm – K

1 dm3 = 1 L

(1 atm) (12 L) = n (0.08205)*(298K)

n = 0.49 mol O2

Excess O2 = 0.49 – 0.45 = 0.04 mol O2

Amount of CO2 produced = 0.1 mol propanol (3 mol CO2/ 1 mol propanol) = 0.3 mol

Amount of H2) produced = 0.1 mol propanol (4 mol H2O/ 1 mol propanol) = 0.4 mol

TOTAL amount of gases = 0.04 + 0.3 + 0.4 = 0.74 mol

Therefore

V = (0.74*0.08205*298)/1

V = 18.0 dm3, the answer is letter D

Answer:The the correct answer is option (A).

Explanation:

$2C_3H_7OH+9O_2\rightarrow 6CO_2+8H_2O$

12 L of oxygen gas burns 0.10 mol of propanol.(1 L = 1 $dm^3$ )

According to reaction, 2 moles of propanol gives 6 moles of $CO_2$ then, 0.10 moles of propanol will give: $(6)/(2)* 0.10$ moles of $CO_2$ that is 0.30 mol.

$n_(CO_2)=0.30 mol$

The final volume of the gas evolved after the reaction can be determined by Ideal gas equation. Since, the reaction is taking place at room temperature the value of pressure and temperature will be:

At room temperature:

Pressure = 1 atm

Temperature , T= 293 K

$PV=nRT$

$PV=n_(CO_2)RT$

$V_(CO_2)=(0.30 mol * 0.0821 L atm/mol K* 298 K)/(1 atm)=7.33 L=7.33 dm^3$

The closest answer from the given options is option (A) that is 7.20 $dm^3$

Determined which equation is balanced or unbalanced.

Answers

Answer:

1. balanced

2.unbalanced

3.unbalabced

4.balanced

Which of the following is a synthesis reaction?C2H4 + 3O2 yields 2CO2 + 2 H2O

2HCl yields H2 + Cl2

2K + 2HCl yields 2KCl + H2

SO3 + H2O yields H2SO4

Answers

SO3+H2O yields H2SO4 is the correct answer for your question, WELCOME:)

the last one is the answer to your question. D is the answer

When May a hypothesis be revised

Answers

Answer: Based on experimental data

Explanation: The hypothesis is not the ultimate proven theory, the more a preliminary assumption on the basis of which further research is carried out with the help of experiments in order to prove the hypothesis as accurate. If the experiments carried out showed that the hypothesis is wrong, it is necessary to revise the hypothesis and set up a new experiment.

a hypothesis may be revised after the experiment that you performed proved it wrong. then after looking over the data you should revise your hypothesis and perform the experiment again.

Explanation of atomic radius

Answers

Ah yes.

The atomic radius is basically the distance between the nucleus of the atom and the outermost electron in the farthest orbital of the atom. The more bigger the atomic radius , the less powerful is the force that holds together the nucleus and its electrons.

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