The statement “traits are passed from parents to offspring independently of one another” is ?

What is the oxidation number of S In Li2SO4? A. +1 B. +2 C. +5 D. +6

-Dominant- [34]

Answer:

6

Explanation:

Li has an oxydation number of 1 2*1 = 2

O has an oxidation number of -2 4(-2) = -8

S has an oxydation number of x 1 * x = x

The oxidation number on the molecule is 0.

So here is the equation

2 - 8 + x = 0 Combine like terms

-6 + x = 0 Add 6 to both sides

-6 + 6 + x = 6 Combine like terms

x = 6

Sulphur in this case has an oxidation number of 6

3 0

3 years ago

Blast furnaces extra pure iron from the Iron(IIl)oxide in iron ore in a two step sequence. In the first step, carbon and oxygen

OLga [1]

Answer:

5.9 kg

Explanation:

We must work backwards from the second step to work out the mass of oxygen.

1. Second step

Mᵣ: 55.84

Fe₂O₃ + 3CO ⟶ 2Fe + 3CO₂

m/kg: 7.0

(a) Moles of Fe

$\text{Moles of FeO} = \text{7000 g Fe} \times \dfrac{\text{1 mol Fe}}{\text{55.84 g Fe}} = \text{125 mol Fe}$

(b) Moles of CO

$\text{Moles of CO} = \text{125 mol Fe} \times \dfrac{\text{3 mol CO}}{\text{2 mol Fe}} = \text{188 mol CO}$

However, this is the theoretical yield.

The actual yield is 72. %.

We need more CO and Fe₂O₃ to get the theoretical yield of Fe.

(c) Percent yield

$\begin{array}{rcl}\text{Percent yield} &=& \dfrac{\text{ actual yield}}{\text{ theoretical yield}} \times 100 \, \%\\\\ 72. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.72 &= &\dfrac{\text{188 mol}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{188 mol}}{0.72}\\& = & \textbf{261 mol}\\\\\end{array}$

We must use 261 mol of CO to get 7.0 kg of Fe.

2. First step

Mᵣ: 32.00

2C + O₂ ⟶ 2CO

n/mol: 261

(a) Moles of O₂

$\text{Moles of O}_{2} = \text{261 mol CO} \times \dfrac{\text{1 mol O}_{2}}{\text{2 mol CO}} = \text{131 mol O}_{2}$

(b) Mass of O₂

$\text{Mass of O}_{2}= \text{131 mol O }_{2} \times \dfrac{\text{32.00 g O}_{2}}{\text{1 mol O}_{2}} = \text{4180 g O}_{2}$

However, this is the theoretical yield.

The actual yield is 71. %.

We need more C and O₂ to get the theoretical yield of CO.

(c) Percent yield

$\begin{array}{rcl}71. \, \% & = & \dfrac{\text{188 mol}}{\text{actual yield}} \times 100 \,\%\\\\0.71 &= &\dfrac{\text{4180 g}}{\text{actual yield}}\\\\\text{Actual yield} & = & \dfrac{\text{4180 g}}{0.71}\\\\& = & \text{5900 g}\\& = & \textbf{5.9 kg}\\\end{array}$

We need 5.9 kg of O₂ to produce 7.0 kg of Fe.

6 0

4 years ago

2. What will you change (the independent variable) in each test?

skad [1K]

Answer:the other vaiabable

Explanation:

8 0

4 years ago

What are the effects of global warming?

svp [43]

the effects are: temperature rises, water shortages, and increased fire threats

7 0

3 years ago

I couldn't find Science, or there is really no Science?

navik [9.2K]

Answer:

Yes

no

yes

no

yes

no

Some of these activitise that i said yes don't nessiseraly require you to hear, rather it would affect your experiance doing them without ears or the ability to hear. You realy don't need to be able to hear to play a gauter, it depends on how you learn.

5 0

3 years ago