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4 years ago

PLEASE PLEASE PLEASE ANSWER THIS CORRECTLY ASAP 50 POINTS

Chemistry

1 answer:

tresset_1 [31]4 years ago

4 0

If I remember correctly, it would be B. A very large amount of energy is produced from a tremendous mass.

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In which way are photosynthesis and cellular respiration different?

Lyrx [107]

Answer:

D. Photosynthesis uses carbon dioxide while cellular produces carbon dioxide

3 0

3 years ago

Read 2 more answers

The radioactive decay of a certain sample produced 846 disintegrations per minute. exactly 3.00 days later, the rate of decay wa

Margarita [4]

Answer:

$\boxed{\text{1.81 da}}$

Explanation:

1. Calculate the decay constant

The integrated rate law for radioactive decay is 1

$\ln\dfrac{A_{0}}{A_{t}} = kt$

where

A₀ and A_t are the counts at t = 0 and t

k is the radioactive decay constant

$\ln \dfrac{846}{269} = k \times 3.00\\\\\ln3.145 = 3.00k\\1.146 = 3.00k\\\\k =\dfrac{1.146}{3}\\\\k = \text{0.382 /da}\\$

2. Calculate the half-life

$t_{\frac{1}{2}} = \dfrac{\ln2}{k} = \dfrac{\ln2}{0.382} = \text{1.81 da}$

The half-life for decay is $\boxed{\textbf{1.81 da}}$ .

3 0

4 years ago

In the space provided, for each element, type the ionic charge of an atom with a full set of valence electrons. Then, type the n

kobusy [5.1K]

11. ionic charge +1, helium.

12. ionic charge 2-, neon.

13. ionic charge 3+, neon.

3 0

3 years ago

Pure hydrogen (H₂) is a hazardous substance. Thus, safer and more cost effective techniques have been developed to store it as a

Paha777 [63]

Answer: hello your question has some missing details attached below is the missing details

answer : 25.5% ( B )

Explanation:

<u>Determine percentage yield </u>

molar mass = 35 g/mol

mass of Li₃N(s) = 70 g

product LiH(s) = 8.0 g ( actual yield )

theoretical yield ( LiH ) = 4 * 7.95 = 31.8 g

percentage yield = actual yield * 100 / theoretical yield

= 8 * 100/31.8

= 25.5%

4 0

3 years ago

What is the relative formula mass of N2O? Ar of N = 14 and Ar of O = 16.

s2008m [1.1K]

We have to calculate formula mass of N₂O.

The answer is: 44

Relative formula mass is the sum of relative atomic mass of constituent atoms in a formula unit of any compound. Relative formula mass is represented as same symbol of relative molecular mass.

To calculate relative formula mass we need to know number of each atom in the formula and then adding atomic masses of all the atoms.

In N₂O, number of N-atom present is equal to 2 and number of O-atom is equal to 1.

Atomic mass of N-atom is 14 and atomic mass of O-atom is 16.

So, formula mass of N₂O is (2 X 14)+16 = 44.

6 0

3 years ago