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Sliva [168]
3 years ago
8

1. How many calcium atoms are in 8CaOH?

Chemistry
2 answers:
Vedmedyk [2.9K]3 years ago
6 0

Answer:

8

Explanation:

the number before the abbrviation for calcium (Ca) shows how many calcium there is.

Vesna [10]3 years ago
4 0

Answer:one

Explanation:

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Answer:

1.A 2.C 3.B

4. d

Explanation:

6 0
3 years ago
The volume of 0.05 M H2SO4 is needed to completely neutralise 15ml of 0.1 M NaOH solution is
Feliz [49]
V(NaOH)=15 mL =0.015 L
C(NaOH)=0.1 mol/L
C(H₂SO₄)=0.05 mol/L

2NaOH + H₂SO₄ = Na₂SO₄ + 2H₂O

n(NaOH)=V(NaOH)C(NaOH)=2n(H₂SO₄)
n(H₂SO₄)=V(H₂SO₄)C(H₂SO₄)

V(NaOH)C(NaOH)=2V(H₂SO₄)C(H₂SO₄)

V(H₂SO₄)=V(NaOH)C(NaOH)/{2C(H₂SO₄)}

V(H₂SO₄)=0.015*0.1/{2*0.05}=0.015 L = 15 mL
5 0
3 years ago
2. A 2.5 mol SAMPLE OF OXYGEN GAS (O2) INCREASES TO 3.2 mol
lana [24]

696.32 mmHg is the final pressure of the gas.

<h3>What is an ideal gas equation?</h3>

The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.

Given data:

P_1 = 720 mmHg              

P_2 = ?

n_1 = 2.5 mol                

n_2 = 3.2 mol

V_1 = 34 L            

V_2 = 45 L

Formula

Combined gas law

\frac{P_1 V_1}{n_1}  = \frac{P_2 V_2}{n_2}

P_2 = 696.32 mmHg

Hence, 696.32 mmHg is the final pressure of the gas.

Learn more about an ideal gas equation here:

brainly.com/question/19251972

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6 0
2 years ago
In which situation has the independent variable for the experiment been changed?
ki77a [65]
Idk cause I’m not completely sure I apologize
7 0
3 years ago
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Alexa is teaching students to measure and compare the speed of a pencil as it is dropped from different heights
Viefleur [7K]
<h3>♫ - - - - - - - - - - - - - - - ~<u>Hello There</u>!~ - - - - - - - - - - - - - - - ♫</h3>

➷ It is because it involves experimentation and observation of the pencil dropping from different heights.

<h3><u>✽</u></h3>

➶ Hope This Helps You!

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3 years ago
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