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Lady_Fox [76]
3 years ago
5

How many atoms of calcium are in a unit of calcium phosphate whose formula is Ca3(PO4)2?

Chemistry
2 answers:
qwelly [4]3 years ago
8 0

Answer: c

Explanation:brainliest

hoa [83]3 years ago
6 0
The correct answer is answer choice C, three. In the formula Ca3 (P O4)2, there are 3 atoms of calcium (Ca), 2 atoms of phosphorus (P), and 8 atoms of oxygen (O). You can tell this by looking at the subscripts (or numbers, in this case, since you can't type subscripts). The subscript applies to the number directly beside it. Furthermore, if you have parentheses with a number beside it, just distribute. In this problem, we have (P O4)2.

(P O4) 2   Given
P2 O8   Distribute
We now have 2 atoms of phosphorus and 8 atoms of oxygen. 

This problem has decided to be nice and just ask for calcium, so we don't have to distribute. All you have to do for this problem is look at the subscript beside Ca, which is 3. Therefore, the correct answer is C.
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Data Table 3: Polystyrene Test Tube, 12x75mm
Lera25 [3.4K]

Answer:

Experiment 8 E Data Table 3 fl Data Table 4 fl Data Table 5 fl Data Table 6 Data Table 3: Polystyrene Test Tube, 12x75mm Volume of water at room temperature (V1 in mL) Volume of gas in polystyrene tube at boil (V2 in mL) Temperature of gas at boil inside polystyrene tube (°C) Volume of gas in polystyrenetube at room temperature (V3 in mL) Temperature of gas.

Explanation:

Hope this helps

Mark as Brainliest please

4 0
2 years ago
Define renewable and nonrenewable resources and give 3 examples
liubo4ka [24]
Renewable resources are resources that can be used repeatedly. Examples are wood, wind power, and solar energy.

Nonrenewable resources are resources that cannot be replaced naturally. Examples are oil, coal, and minerals. 
4 0
3 years ago
A family of four lives in a three-bedroom house and uses an average of 900 kWh of electricity per month. The family cools their
agasfer [191]
<h2>Answer:</h2><h2>The percentage of the family’s total annual electricity that is used to run the two air conditioners for the three summer months = 19.4 %</h2>

Explanation:

Average electricity consumed per month = 900 kWh

The family cools their house for three months during the summer with two window-unit air conditioners

The power consumed by one window-unit air conditioners = 350 kWh

The power consumed by two window-unit air conditioners = 350(2) = 700 kWh

Power consumed for two air conditioners for the three summer months = 700 (3) = 2100 kWh

Total power consumed for 1 year = 900 (12) = 10800kWh

The percentage of the family’s total annual electricity that is used to run the two air conditioners for the three summer months = \frac{2100}{10800}100 = 19.4 %

5 0
2 years ago
A sample of a compound is determined to have 1.17 g of carbon and 0.287 g of hydrogen. what is the correct representation of the
yarga [219]

CH3 is the empirical formula for the compound.

A sample of a compound is determined to have 1.17g of Carbon and 0.287 g of hydrogen.

The number of atom or moles in the compound is

1.17 g C X  1 mol of C / 12.011 g C = 0.097411 mol of C.

0.287 g H x 1 mol of  H / 1 g H = 0.28474 mol H.

This compound contains 0.097411 mol of carbon and 0.28474 mol of Hydrogen.

So we can represent the compound with the formula C0.974H0.284.

Subscripts in formulas can be made into whole numbers by multiplying the smaller subscript by the larger subscript.

we can divide 0.284 by 0.0974.

0.284 / 0.0974 = 3.

So here, Carbon is one and hydrogen is 3.

We can write the above formula as a CH3.

Hence the empirical formula for the sample compound is CH3.

For a detailed study of the empirical formula refer given link brainly.com/question/13058832.

#SPJ1.

5 0
1 year ago
Name the type of chemical reaction that occurs when magnesium chloride solution reacts with sodium carbonate solution
Svetlanka [38]

Answer:

precipitation reaction

8 0
3 years ago
Read 2 more answers
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