Answer:
B) 4 hours
Explanation:
the equation relating speed , distance and time is as follows
speed = distance / time taken
the van moves 50 miles at 20 mph and the next 84 miles at 56 mph
so lets calculate the time taken at both speeds
substituting the values in the above equation
20 mph = 50 miles / time
time taken = 50 / 20 = 2.5 hours
56 mph = 84 miles / time
time taken = 1.5 hours
the totat time taken is - 2.5 + 1.5 = 4 hours
Answer:
Explanation:
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In this case, since these mole-mass relationships are understood in terms of the moles of the atoms forming the considered compound, we first realize that the chemical formula of the cobalt (III) nitrate is Co(NO₃)₃ whereas there is a 1:1 mole ratio of the cobalt (III) ion (molar mass = 58.93 g/mol) to the entire compound. In such a way, we first compute the moles of the salt (molar mass = 58.93 g/mol) and then apply the aforementioned mole ratio to obtain the grams of the required cation:
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Rock that has formed by sediment deposited by water or air