4 years ago

A train travels 65 km in three hours and then 52 km in two hours. What is its average speed?

1 answer:

Darya [45]4 years ago

5 0

the average speed is 23.4 km per hour cause it is total distance over total time equal to average speed

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blsea [12.9K]

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spayn [35]

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4 years ago

zloy xaker [14]

<span>d.polar covalent; hydrogen</span>

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3 years ago

Amiraneli [1.4K]

Answer:

Six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six

Explanation:

Hello there!

In this case, according to the molecular formula of the two moles of calcium phosphate:

$2Ca_3(PO_4)_2$

Thus, in order to calculate the atoms of each atom, it is necessary to multiply the two in front of the formula by the subscripts in the reaction:

$atoms Ca=2*3=6\\\\atoms P=2*2=4\\\\atoms O=2*2*4=16$

Thus, we obtain six atoms of calcium, four of phosphorous and sixteen of oxygen for a total of twenty six.

Best regards!

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3 years ago

Sliva [168]

The correct answer is Contractile Vacoules

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3 years ago