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Heat leaks into the interior compartment of a refrigerator at a rate of 100 cal/s. if the air outside is 30 degC, how many watts of electricity are needed to keep the interior at 4 degC? assume an ideal, reversible refrigerator.
What is teh dilution of your unknown, so calculate back to final concentration. And if 1000 ppm is to be used for the serial dilutions (unknown is close to 1 ppm), what standard concentration should I use for additions
a 1.00 g sample of an alloy of copper and aluminum was reacted with hydrochloric acid , and 85.0 mL of hydrogen gas (measured atSTP) was produced.
Can anyone show a picture or a link to show me the mechanism for maleic acid to fumeric acid and include where the electrons are transferred from and where they are going
What is the total sample size (in grams) for a sample of disulfur octoxide which contains 3.29 g of oxygen
85.0 of is initially at room temperature (22). A chilled steel rod at 2 is placed in the water. If the final temperature of the system is 21.2, what is the mass of the steel bar?
It has a pressure of 46.3 mmHg and 24.6 C (degrees). what is the molecular formula og the compound
When 1.7 g sodium nitride is heated it forms sodium metal and nitrogen gas. How many grams of each are formed?
how many milliliters of a .250 m sulfuric acid solution would be required to completely react with 2.398 grams of solid
A 250.0-L cylinder contains 65.0% He(g) and 35.0% Kr(g) by mass at 25.0° C and 1.35 atm total pressure. What is the partial pressure of He in this container?
Which of the following is true about any R enantiomer. A. it has a + rotation b. it has a - rotation c. it is a mirror image of the S enantiomer is it A only B only A and C or B and C
Nitrogen and hydrogen gases are combined at high temperatures and pressures to produce ammonia, NH3. If 104.7 g of N2 are reacted with excess H2, how many moles of NH3 will be formed?
What concentration of Fe^3+ is needed to maintain the phosphate concentration below the limit of 1 mg P/L? Any help on how to do or even start the problem would be great.
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