3 years ago

CAN SOMEONE HELP PLS!!!

Chemistry

2 answers:

Pachacha [2.7K]3 years ago

6 0

Answer:

Matals tend to LOSE electrons to become POSITIVE ions

nikdorinn [45]3 years ago

5 0

The correct answer is C.

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2. How many grams of water can be heated from 20.0 oC to 75oC using 12500.0 Joules?

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= 0.054 kg or 54 g

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Using the equation; Q = mcΔT where Q is the quantity of heat transferred, m is the mass, c is specific heat of the substance, ΔT is delta T, the change in temperature.

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How many grams of phosphorus are in a sample of Ca3(PO4)2 that contains 50.0 g of calcium? Answer: ________ grams of phosphorus.

wel

<u>Answer:</u> The mass of phosphorus that is present for given amount of calcium is 28.53 g.

<u>Explanation:</u>

We are given:

Mass of calcium = 50 grams

The chemical formula of calcium phosphate is $Ca_3(PO_4)_2$

Molar mass of calcium = 40 g/mol

Molar mass of phosphorus = 31 g/mol

In 1 mole of calcium phosphate, 120 grams of calcium is combining with 62 grams of phosphorus.

So, 50 grams of calcium will combine with = $\frac{62}{120}\times 50=28.53g$ of phosphorus.

Hence, the mass of phosphorus that is present for given amount of calcium is 28.53 g.

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