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Otrada [13]
3 years ago
11

Which of the following is correct for the equation below? 2P(s) + 3Cl2(g) → 2PCl3(g) + 574 kJ

Chemistry
2 answers:
Lilit [14]3 years ago
4 0
It's the first option choice on Plato
inysia [295]3 years ago
4 0

the correct answer is "  ΔH = –574kJ "



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ASAP PLS
AveGali [126]

Answer:

think I did this before and its V

8 0
3 years ago
0.820 L has a mass of 2.56kg what is the density of this liquid in kg/L
3241004551 [841]

Density ρ=\frac{m}{v}

=\frac{2.56 kg}{0.820 L} \\=3.121kg/L

8 0
3 years ago
Which has the greatest atomic number , boron or lithium ?
Kay [80]
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4 0
3 years ago
Read 2 more answers
A volume of 25.36 ± 0.05 mL 25.36±0.05 mL of HNO 3 HNO3 solution was required for complete reaction with 0.8311 ± 0.0007 g 0.831
Sholpan [36]

Answer:

MOLARITY= 0.3092mol/l

ABSOLUTE UNCERTAINTY= 0.000873

Explanation:

The equation of reaction is

2HNO3 + Na2CO3 ⟶ 2NaNO3 + H2O + CO2.

QUESTION1: CALCULATION FOR MOLARITY;

Molarity= gram mole of solute ÷ liters of solution

Where;

Mole of solute= mass ÷ molar mass

Therefore;

Mole of solute= 0.8311g ÷ 105.988g/mol= 0.0078515mol

MOLARITY= 0.0078415mol ÷ 25.36ml = 0.0003092mol/ml = 0.3092mol/l

This is the Molarity of the solution

QUESTION2: CALCULATION FOR ABSOLUTE UNCERTAINTY;

Uncertainty (u) =√([0.05 ÷ 25.36]^2 + [0.001 ÷ 105.988]^2 + [0.0007 ÷ 0.8311]^2) × Molarity

Solving brackets gives

(0.00197161+0.00000943503+0.00084226) ×Molarity

Adding up gives

0.002823×Molarity

Therefore;

ABSOLUTE UNCERTAINTY= 0.002823×0.3092= 0.000873

5 0
3 years ago
Why is it that no two elements have the exact same emission spectrum?​
jonny [76]

Answer:

When atoms are excited they emit light of certain wavelengths which correspond to different colors. Each element produces a unique set of spectral lines. Since no two elements emit the same spectral lines, elements can be identified by their line spectrum.

Explanation:

5 0
3 years ago
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