Please help if you can. Directions: Answer the following problems. Be sure to show all work. Always include units.
1) . A sample of seawater weighs 158 grams and has a volume of 156 ml. What is the density?
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2) . A cylindrical box with a volume of 200 cm3 holds 432 g of sodium chloride. Calculate the density of the salt.
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3) 200 ml of ethyl alcohol is added to a 60 g graduated cylinder for a total mass of 217.8 g. What is the density of the ethyl alcohol?
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d=

What is a property of a double replacement reaction

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)