Phosphine, an Extremely Poisonous and Highly Reactive Gas, Will React

question 12

Multiple Choice

Phosphine, an extremely poisonous and highly reactive gas, will react with oxygen to form tetraphosphorus decaoxide and water. PH₃(g) + O₂(g)  P₄O₁₀(s) + H₂O(g) [unbalanced]
Calculate the mass of P₄O₁₀(s) formed when 225 g of PH₃ reacts with excess oxygen.

• A) 1880 g
• B) 940. g
• C) 900. g
• D) 470 g
• E) 56.3 g

Comprehend the statistical distributions related to product life cycles, such as the normal and exponential distributions.

Calculate mean time between failures (MTBF) and failure rate (FR) from given data.

Appreciate the importance of maintenance strategy choices between preventive and breakdown maintenance and their financial implications.

Understand the concept of present value and how it applies to real and nominal cash flows.

---

Definitions:

Price Increase

A rise in the cost of goods and services, which can be caused by factors such as inflation, increased production costs, or higher demand.

Demand Curves

Graphs displaying the relationship between the price of a good and the quantity demanded by consumers, typically downward sloping.

Original Price

The initial price of a product or service before any discounts, markdowns, or promotions.

Percentage Changes

A mathematical calculation that indicates how much a quantity has increased or decreased in percentage terms compared to a previous period.