Dalal

Which of the following are exact numbers? a. There are 100 cm in 1 m. b. One meter equals 1.094 yard. c. We can use the equation: F=9/5 C + 32 to convert from Celsius to Fahrenheit temperature. Are the numbers 9/5 and 32 exact or inexact? d. π

7 years ago

A copper wire (density=8.96 g/cm^3) has a diameter of 0.25 mm. If a sample of this copper wire has a mass of 22 g, how long is the wire?

7 years ago

Convert 0.0904 in^3 to liters. (2.54 cm = 1 inch, 1 L= 1000 cm^3, 1 ft = 12 inches) Really appreciate it if you can show steps please.

7 years ago

The mass of a dry, 50 mL beaker is 49.135 g. The observed volume of water in a volumetric pipet is 20.00 mL. This water is transferred to the beaker and the combined mass of the water and the beaker is found to be 69.122 g. Given that the density of water...

7 years ago

Name each of the following compounds: a. CrO3 c. Al2O3 e. CaBr2 b. Cr2O3 d. NaH f. ZnCl2

7 years ago

Write the formula for each of the following compounds: a. cesium bromide b. barium sulfate c. ammonium chloride d. chlorine monoxide e. silicon tetrachloride f. chlorine trifluoride g. beryllium oxide h. magnesium fluoride

7 years ago

Several compounds containing only sulfur (S) and fluorine (F) are known. Three of them have the following compositions: i. 1.188 g of F for every 1.000 g of S ii. 2.375 g of F for every 1.000 g of S iii. 3.563 g of F for every 1.000 g of S How do these da...

7 years ago

Which of the following pairs of compounds can be used to illustrate the law of multiple proportion? a) NH3 and NH4Cl b) ZnO2 and ZnCl2 c) H2O and HCl d) NO and NO2 Could you also briefly explain why, please. Thank you.

7 years ago

Thanks in advance. A student prepared a solution of NaCl by dissolving 55.0 grams of sodium chloride in 570 mL of water. What is the percent by mass of the NaCl solution?

7 years ago

A graduated cylinder has a mass of 80.4 g when empty. When 20.0 mL of water is added, the graduated cylinder has a mass of 100.4 g. If a stone is added to the graduated cylinder, the water level rises to 43.5 mL and the total mass is now 156.1 g. What is...

7 years ago

Need help, please. A copper wire (density = 8.96 g/cm^3) has a diameter of 0.25 mm. If a sample of this copper wire has a mass of 22 g, how long is the wire? Thank you.

7 years ago

A water chemist obtained a 250 ml sample from a nearby lake and fixed the oxygen on-site with alkaline solutions of MnSO4 and KI-NAN3. Returning to the laboratory, a 200 ml sample was analyzed by acidifying the sample with conc H2SO4 and then titrating wi...

7 years ago

a 20.94-g sample of an unknown metal is heated to 99.4 degrees Celsius in a hot water bath until thermal equilibrium is reached. The metal is quickly transferred to 100 mL of water at 22.0 degrees Celsius contained in a styrofoam cup. The thermal equilibr...

7 years ago

A 5.00-g sample of KBr at 25.0 C dissolves in 25.0 mL of water also at 25.0 C. The final equilibrium temperature of the resulting solution is 18.1 C. What is the enthalpy of solution, delta H (s), of KBr expressed in kilojoules per mole? Last one on prela...

7 years ago

5.00 g of (Zn) was added to 0.800 moles of nitrate ion in acidic media. Calculate the volume of (NO) gas collected at STP. Zn(s) + No3^-(aq) ---------> ZN^2+(aq) + NO(g) (Must balance the reaction first). Thank you.

7 years ago

Use the generalized compressibility chart to estimate z for (a) nitrogen at 40°C and 40 MPa and (b) helium at -200°C and 350 atm. (Don't forget Newton's corrections.) Thanks.

7 years ago

Consider the polar curve: r=3cos(3ϴ) a) Find the area of the first leaf of the graph. -Thank you.

7 years ago

Find the power series representation about the center c=0 of (a) f(x)= 1/(1+x^2) (b) Use part (a) to find the power series of g(x)=ln(1+x^2) -Thank You

7 years ago

2.000 g

10 years ago

Really need some help solving these please.

7 years ago

Thank you so much for your help. I actually sent the second one because I realized I had forgotten to say please in the first one.

7 years ago

The thing is I really want to understand them without google?..Because I won't have google during my exam..Thanks anyways..

7 years ago

If possible could you briefly explain why as well please.

7 years ago

Without Google! Whats the theoretical way to solve them?

7 years ago

Thank you. :)

7 years ago

In addition, 5. a) What is the procedure for preparing 250 mL of 0.0210 M Na2S2O3 for this experiment from a 100-mL volume of standard 0.106 M Na2S2O3? b) For the preparation of the 0.0210 M solution in a 250-mL volumetric flask, only a 25.0 mL calibrated...

7 years ago

Correction: Zn(s) + NO3^-(aq) ---------> ZN^2+(aq) + NO(g)

7 years ago