Could please answer these questions and please make sure they are coreect 1- +++

Question

Could please answer these questions and please make sure they are coreect

1-

+++++++

2-

+++++++

3-

+++++++

4-

+++++++

5-

++++++

6-

+++++++

7-

+++++++

8-

thank you

To make 2.5 L of 0.10 M hydrochloric acid, you would dilute 41.7 mL of 6.0 M HCl to 2.5 L with water determine the mass of 0.10 mol HCl and dissolve it in 2.5 L of water dilute 0.25 L of pure HCl to 2.5 L with water add 50 mL of 6.0 M HCl to 2.45 L of water dilute 59.4 mL of 3.0 M HCl to 2.5 L with water Carbon tetrafluoridc has a higher boiling point than boron trifluoride. This can best be explained by stronger dispersion forces between carbon tetrafluoride molecules than boron trifluoride molecules stronger boron-fluorine covalent bonds than carbon-fluorine covalent bonds stronger hydrogen bonding forces between carbon tetrafluoride molecules than boron trifluoride molecules carbon tetrafluoride is polar boron trifluoride is not carbon tetrafluoride having greater polarity than boron trifluoride Tetraethylcyclohexane contains 14.4% hydrogen and 85.6% carbon by mass. What is the empirical formula for methylcyclohexane? C 2 H 5 CH 2 C 2 H 3 CH 3 CH Calcium metal has a face-centered cubic lattice. How many atoms are contained in the unit cell? If the concentration of CO 2 is 2.93 g of CO 2 per 1.00 L of soft drink when bottled under 2.0 atm of CO 2 pressure, what will be the concentration of the CO 2 in the after it has been opened and left to come to equilibrium with air having a CO 2 particles pressure of 3.0 Times 10 -4 atm? 4.4 Times 10 -4 g CO 2/L 8.8 Times 10 -2 g CO 2/L l.0 Times l0 -4 g CO 2 /L 2.2 Times 10 -3 g CO 2/L 2.0 Times 10 -4 g CO 2/L Phase diagrams show how a particular substance behaves as a function of temperature and pressure. In the diagram below, line AB shows the transformation between liquid and solid. Which statement about this diagram is never true? Increasing pressure at constant temperature can cause deposition of solid from gas Increasing pressure at constant temperature can melt the solid Increasing pressure at constant temperature can cause liquid to freeze Increasing temperature at constant pressure can cause the liquid to vaporize Increasing temperature at constant pressure can cause the solid to sublime The boiling points of the following substances increase in the order CH 4

Explanation / Answer

1) moles of HCl = 2.5 x 0.1 = 0.25

a) moles of Hcl = 41.7 x 6 /1000 = 0.25 moles

so moles are same .

SO 41.7 ml of 6 M HCl is diluted to 2.5 L to get 2.5 L of 0.1 M Hcl

answer is option A

2) the answer is option A

both CF4 and BF3 are non polar only differ in the structure and intermolecular forces

which brings a difference in boiling point

3) 100 grams of compound contains

14.4 grams of H and 85.6 grams of C

moles of H = 14.4 /1 =14.4

moles of C = 85.6 /12 = 7.13

C;H = 7.13 ; 14.4

C:H = 1:2

so empirical formula is CH2

4) face centred cube = 1/8 x 8 corners + 1/2 x 6 faces

face centred cube = 4 atoms

so the option is e

5) Co2 will flow out till the pressures are equal .

So P1/m1 = P2/m2

m2 = P2m1 / P1

m2 = 3 x 10-4 x 2.93 / 2

m2 = 4.395 x 10-4 g

So final mass of C02 is 4.395 x 10-4 g

conc is 4.395 x 10-4 g/L

So the answer is option A

6) C

7) B

8) A

Related Questions

Navigate

• Browse (All)
• Browse C
• Subjects

---