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Calculate the mole fraction of solute in the aqueous solution of 13% C2H5OH.
What volume did a helium-filled balloon have at 26.8 °C and 1.87 atm if its new volume was 63.2 mL at 2.22 atm and 9.6°C? O a. 79.6 O b. 209 O c. 70.7 O d. 56.5
Balance the following redox reactions: (8pts, 4pts each)
a) Cu (s) + NO3- (aq) à Cu2+(aq) + NO (g) (acidic medium)
Oxidation Half Reaction:
Reduction Half Reaction:
Net Reaction:
b) MnO4- (aq) + NO2-(aq) à Mn2+ (s) + NO3- (aq) (basic medium)
Oxidation Half Reaction:
Reduction Half Reaction:
Net Reaction:
given z1 = 2<45 degrees, z2 =3<120 degrees and z3 =4<180 degrees. determine the following and leave your answer in rectangular form.
- (z1)2+z2/z2+z3
- z1/z2z3
A 1.5 nC particle with an initial velocity of 4.75x106 m/s along the positive x-axis enters a region of uniform magnetic field and electric field The magnetic field is 3.25 T along the positive y-axis calculate the magnitude and direction of the electric field if the particle passes the region undeflected
. The hospital record shows that the mean weight of newly born baby is greater than 7 lbs. A researcher takes a sample of 25 newly born babies and found to have a mean weight of 6.97lbs with the standard deviation of 0.77 lbs. Test the claim at 0.05 level of significance.
Treatment of a 0.25000-g sample of impure potassium chloride with an excess of AgNO3 resultion of 0.2912g of AgCl. Calculate the percentage of CCl in the sample.
A rural health unit conducted a survey on the heights of the male aged 18 to 24 years old it was found out that the mean height of male aged 18 to 24 years old was 70 inches test the hypothesis that the mean height of the male aged 18 to 24 years old is not 70 inches if a random sample of 20 male aged 18 to 24 years old had a mean height of 65 inches with a standard deviation of 3 use 1% level of significance
A 7.70-kg steel ball at 18.7°C is dropped from a height of 12.7 m into an insulated container with 4.50 L of water at 10.1°C. If no water splashes, what is the final temperature of the water and steel? The specific heat of steel and water is 450 J/(kg·K) and 4186 J/(kg·K) respectively.
How much internal energy is generated when a 19.8-g lead bullet, traveling at 7.80 × 102 m/s, comes to a stop as it strikes a metal plate?
