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A certain instrument has a has a standard deviation of 1.7280%. How many replicate measurements are necessary if the standard error mean is to be 0.0210%?
How many grams of methane [CH4 (g)] must be combusted to heat 1.19 kg of water from 25*C to 60*C, assuming H2O (l) as a product and 100% efficiency in heat transfer?
what is the concentration of chromium ion present in a 0.07092 M solution of potassium hydroxide in contact with a large excess of a precipitate
Cd2+, Co2+ is saturated with H2S at a pH of 3.00. Which metals form a sulfide solid? [H2S]sat=0.10 and Ka1= 1.3e-7 and Ka2=8.5e-14
600 torr contains 50.0% Helium and 50.0% Xenon by mass. What are the partial pressures of the individual gasses?
consider radiation of wavelength of 8000 Angestroms, at a temprature of 1000 K. using a planck law, calculate the energy per unit volume
If you start with 5.0mL of isopentyl alcohol and after esterification via glacial acetic acid you obtain 6.2mL of isopentyl acetate
How many moles of nitrate ions are present in a sample that contains 4.82 moles of chromium(III) nitrate, Cr(NO3)3
What is the temperature change of the water if the downstream diameter is 3.8 cm? If it is 7.5 cm? What is the maximum temperature change for an enlargement in the pipe?
I'm working on a Lewis Structures sheet. After we have completed the structures, which i have, we need to predict the shape of the molecule in VSEPR. What is the shape of a C2H6 amd a C2H4 molecule in VSEPR?
How do you calculate the mass of solvent (assume that the density of water is 1.000g/mL): Please show how to solve the problem. NaCl with a mass of 11.47g and volume of water 108.76g
Two of the Group 12 elements exhibit very similar chemistries to one another, while the chemistry of the third is somewhat different. Identify the Group 12 element whose chemistry is different from the other two Group 12 elements.
The air track carts in the figure are sliding to the right at 1.0 meter per second. Find the speed of the carts.
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